usr.sbin/route6d/route6d.c

   1 /*      $FreeBSD: src/usr.sbin/route6d/route6d.c,v 1.2.2.5 2001/07/03 11:02:09 ume Exp $        */
   2 /*      $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $        */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $KAME: route6d.c,v 1.64 2001/05/08 04:36:37 itojun Exp $
  33  */
  34
  35 #define _KERNEL_STRUCTURES
  36
  37 #include <stdio.h>
  38
  39 #include <time.h>
  40 #include <unistd.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <signal.h>
  44 #include <stdarg.h>
  45 #include <syslog.h>
  46 #include <stddef.h>
  47 #include <errno.h>
  48 #include <err.h>
  49
  50 #include <sys/types.h>
  51 #include <sys/param.h>
  52 #include <sys/file.h>
  53 #include <sys/socket.h>
  54 #include <sys/ioctl.h>
  55 #include <sys/sysctl.h>
  56 #include <sys/uio.h>
  57 #include <net/if.h>
  58 #if defined(__DragonFly__)
  59 #include <net/if_var.h>
  60 #endif /* __DragonFly__  */
  61 #include <net/route.h>
  62 #include <netinet/in.h>
  63 #include <netinet/in_var.h>
  64 #include <netinet/ip6.h>
  65 #include <netinet/udp.h>
  66 #include <netdb.h>
  67 #include <ifaddrs.h>
  68
  69 #include <arpa/inet.h>
  70
  71 #include "route6d.h"
  72
  73 #define MAXFILTER       40
  74
  75 #ifdef  DEBUG
  76 #define INIT_INTERVAL6  6
  77 #else
  78 #define INIT_INTERVAL6  10      /* Wait to submit a initial riprequest */
  79 #endif
  80
  81 /* alignment constraint for routing socket */
  82 #define ROUNDUP(a) \
  83         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
  84 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
  85
  86 /*
  87  * Following two macros are highly depending on KAME Release
  88  */
  89 #define IN6_LINKLOCAL_IFINDEX(addr) \
  90         ((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
  91
  92 #define SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
  93         do { \
  94                 (addr).s6_addr[2] = ((index) >> 8) & 0xff; \
  95                 (addr).s6_addr[3] = (index) & 0xff; \
  96         } while (0)
  97
  98 struct  ifc {                   /* Configuration of an interface */
  99         char    *ifc_name;                      /* if name */
 100         struct  ifc *ifc_next;
 101         int     ifc_index;                      /* if index */
 102         int     ifc_mtu;                        /* if mtu */
 103         int     ifc_metric;                     /* if metric */
 104         u_int   ifc_flags;                      /* flags */
 105         short   ifc_cflags;                     /* IFC_XXX */
 106         struct  in6_addr ifc_mylladdr;          /* my link-local address */
 107         struct  sockaddr_in6 ifc_ripsin;        /* rip multicast address */
 108         struct  iff *ifc_filter;                /* filter structure */
 109         struct  ifac *ifc_addr;                 /* list of AF_INET6 addresses */
 110         int     ifc_joined;                     /* joined to ff02::9 */
 111 };
 112
 113 struct  ifac {                  /* Adddress associated to an interface */
 114         struct  ifc *ifa_conf;          /* back pointer */
 115         struct  ifac *ifa_next;
 116         struct  in6_addr ifa_addr;      /* address */
 117         struct  in6_addr ifa_raddr;     /* remote address, valid in p2p */
 118         int     ifa_plen;               /* prefix length */
 119 };
 120
 121 struct  iff {
 122         int     iff_type;
 123         struct  in6_addr iff_addr;
 124         int     iff_plen;
 125         struct  iff *iff_next;
 126 };
 127
 128 struct  ifc *ifc;
 129 int     nifc;           /* number of valid ifc's */
 130 struct  ifc **index2ifc;
 131 int     nindex2ifc;
 132 struct  ifc *loopifcp = NULL;   /* pointing to loopback */
 133 int     loopifindex = 0;        /* ditto */
 134 fd_set  sockvec;        /* vector to select() for receiving */
 135 int     rtsock;         /* the routing socket */
 136 int     ripsock;        /* socket to send/receive RIP datagram */
 137
 138 struct  rip6 *ripbuf;   /* packet buffer for sending */
 139
 140 /*
 141  * Maintain the routes in a linked list.  When the number of the routes
 142  * grows, somebody would like to introduce a hash based or a radix tree
 143  * based structure.  I believe the number of routes handled by RIP is
 144  * limited and I don't have to manage a complex data structure, however.
 145  *
 146  * One of the major drawbacks of the linear linked list is the difficulty
 147  * of representing the relationship between a couple of routes.  This may
 148  * be a significant problem when we have to support route aggregation with
 149  * supressing the specifices covered by the aggregate.
 150  */
 151
 152 struct  riprt {
 153         struct  riprt *rrt_next;        /* next destination */
 154         struct  riprt *rrt_same;        /* same destination - future use */
 155         struct  netinfo6 rrt_info;      /* network info */
 156         struct  in6_addr rrt_gw;        /* gateway */
 157         u_long  rrt_flags;              /* kernel routing table flags */
 158         u_long  rrt_rflags;             /* route6d routing table flags */
 159         time_t  rrt_t;                  /* when the route validated */
 160         int     rrt_index;              /* ifindex from which this route got */
 161 };
 162
 163 struct  riprt *riprt = NULL;
 164
 165 int     dflag = 0;      /* debug flag */
 166 int     qflag = 0;      /* quiet flag */
 167 int     nflag = 0;      /* don't update kernel routing table */
 168 int     aflag = 0;      /* age out even the statically defined routes */
 169 int     hflag = 0;      /* don't split horizon */
 170 int     lflag = 0;      /* exchange site local routes */
 171 int     sflag = 0;      /* announce static routes w/ split horizon */
 172 int     Sflag = 0;      /* announce static routes to every interface */
 173 unsigned long routetag = 0;     /* route tag attached on originating case */
 174
 175 char    *filter[MAXFILTER];
 176 int     filtertype[MAXFILTER];
 177 int     nfilter = 0;
 178
 179 pid_t   pid;
 180
 181 struct  sockaddr_storage ripsin;
 182
 183 struct  rtentry rtentry;
 184
 185 int     interval = 1;
 186 time_t  nextalarm = 0;
 187 time_t  sup_trig_update = 0;
 188
 189 FILE    *rtlog = NULL;
 190
 191 int logopened = 0;
 192
 193 static  u_long  seq = 0;
 194
 195 volatile int signo;
 196 volatile sig_atomic_t seenalrm;
 197 volatile sig_atomic_t seenquit;
 198 volatile sig_atomic_t seenusr1;
 199
 200 #define RRTF_AGGREGATE          0x08000000
 201 #define RRTF_NOADVERTISE        0x10000000
 202 #define RRTF_NH_NOT_LLADDR      0x20000000
 203 #define RRTF_SENDANYWAY         0x40000000
 204 #define RRTF_CHANGED            0x80000000
 205
 206 int main(int, char **);
 207 void sighandler(int);
 208 void ripalarm(void);
 209 void riprecv(void);
 210 void ripsend(struct ifc *, struct sockaddr_in6 *, int);
 211 int out_filter(struct riprt *, struct ifc *);
 212 void init(void);
 213 void sockopt(struct ifc *);
 214 void ifconfig(void);
 215 void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
 216 void rtrecv(void);
 217 int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
 218         const struct sockaddr_in6 *);
 219 int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
 220         const struct sockaddr_in6 *);
 221 void filterconfig(void);
 222 int getifmtu(int);
 223 const char *rttypes(struct rt_msghdr *);
 224 const char *rtflags(struct rt_msghdr *);
 225 const char *ifflags(int);
 226 int ifrt(struct ifc *, int);
 227 void ifrt_p2p(struct ifc *, int);
 228 void applymask(struct in6_addr *, struct in6_addr *);
 229 void applyplen(struct in6_addr *, int);
 230 void ifrtdump(int);
 231 void ifdump(int);
 232 void ifdump0(FILE *, const struct ifc *);
 233 void rtdump(int);
 234 void rt_entry(struct rt_msghdr *, int);
 235 void rtdexit(void);
 236 void riprequest(struct ifc *, struct netinfo6 *, int,
 237         struct sockaddr_in6 *);
 238 void ripflush(struct ifc *, struct sockaddr_in6 *);
 239 void sendrequest(struct ifc *);
 240 int sin6mask2len(const struct sockaddr_in6 *);
 241 int mask2len(const struct in6_addr *, int);
 242 int sendpacket(struct sockaddr_in6 *, int);
 243 int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
 244 int delroute(struct netinfo6 *, struct in6_addr *);
 245 struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
 246 void krtread(int);
 247 int tobeadv(struct riprt *, struct ifc *);
 248 char *allocopy(char *);
 249 char *hms(void);
 250 const char *inet6_n2p(const struct in6_addr *);
 251 struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
 252 struct in6_addr *plen2mask(int);
 253 struct riprt *rtsearch(struct netinfo6 *, struct riprt **);
 254 int ripinterval(int);
 255 time_t ripsuptrig(void);
 256 void fatal(const char *, ...)
 257         __attribute__((__format__(__printf__, 1, 2)));
 258 void trace(int, const char *, ...)
 259         __attribute__((__format__(__printf__, 2, 3)));
 260 void tracet(int, const char *, ...)
 261         __attribute__((__format__(__printf__, 2, 3)));
 262 unsigned int if_maxindex(void);
 263 struct ifc *ifc_find(char *);
 264 struct iff *iff_find(struct ifc *, int);
 265 void setindex2ifc(int, struct ifc *);
 266
 267 #define MALLOC(type)    ((type *)malloc(sizeof(type)))
 268
 269 int
 270 main(int argc, char **argv)
 271 {
 272         int     ch;
 273         int     error = 0;
 274         struct  ifc *ifcp;
 275         sigset_t mask, omask;
 276         FILE    *pidfile;
 277         char *progname;
 278         char *ep;
 279
 280         progname = strrchr(*argv, '/');
 281         if (progname)
 282                 progname++;
 283         else
 284                 progname = *argv;
 285
 286         pid = getpid();
 287         while ((ch = getopt(argc, argv, "A:N:O:R:T:L:t:adDhlnqsS")) != -1) {
 288                 switch (ch) {
 289                 case 'A':
 290                 case 'N':
 291                 case 'O':
 292                 case 'T':
 293                 case 'L':
 294                         if (nfilter >= MAXFILTER) {
 295                                 fatal("Exceeds MAXFILTER");
 296                                 /*NOTREACHED*/
 297                         }
 298                         filtertype[nfilter] = ch;
 299                         filter[nfilter++] = allocopy(optarg);
 300                         break;
 301                 case 't':
 302                         ep = NULL;
 303                         routetag = strtoul(optarg, &ep, 0);
 304                         if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
 305                                 fatal("invalid route tag");
 306                                 /*NOTREACHED*/
 307                         }
 308                         break;
 309                 case 'R':
 310                         if ((rtlog = fopen(optarg, "w")) == NULL) {
 311                                 fatal("Can not write to routelog");
 312                                 /*NOTREACHED*/
 313                         }
 314                         break;
 315 #define FLAG(c, flag, n)        case c: do { flag = n; break; } while(0)
 316                 FLAG('a', aflag, 1); break;
 317                 FLAG('d', dflag, 1); break;
 318                 FLAG('D', dflag, 2); break;
 319                 FLAG('h', hflag, 1); break;
 320                 FLAG('l', lflag, 1); break;
 321                 FLAG('n', nflag, 1); break;
 322                 FLAG('q', qflag, 1); break;
 323                 FLAG('s', sflag, 1); break;
 324                 FLAG('S', Sflag, 1); break;
 325 #undef  FLAG
 326                 default:
 327                         fatal("Invalid option specified, terminating");
 328                         /*NOTREACHED*/
 329                 }
 330         }
 331         argc -= optind;
 332         argv += optind;
 333         if (argc > 0) {
 334                 fatal("bogus extra arguments");
 335                 /*NOTREACHED*/
 336         }
 337
 338         if (geteuid()) {
 339                 nflag = 1;
 340                 fprintf(stderr, "No kernel update is allowed\n");
 341         }
 342         openlog(progname, LOG_NDELAY|LOG_PID, LOG_DAEMON);
 343         logopened++;
 344
 345         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL)
 346                 fatal("malloc");
 347         memset(ripbuf, 0, RIP6_MAXMTU);
 348         ripbuf->rip6_cmd = RIP6_RESPONSE;
 349         ripbuf->rip6_vers = RIP6_VERSION;
 350         ripbuf->rip6_res1[0] = 0;
 351         ripbuf->rip6_res1[1] = 0;
 352
 353         init();
 354         ifconfig();
 355         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 356                 if (ifcp->ifc_index < 0) {
 357                         fprintf(stderr,
 358 "No ifindex found at %s (no link-local address?)\n",
 359                                 ifcp->ifc_name);
 360                         error++;
 361                 }
 362         }
 363         if (error)
 364                 exit(1);
 365         if (loopifcp == NULL) {
 366                 fatal("No loopback found");
 367                 /*NOTREACHED*/
 368         }
 369         loopifindex = loopifcp->ifc_index;
 370         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
 371                 ifrt(ifcp, 0);
 372         filterconfig();
 373         krtread(0);
 374         if (dflag)
 375                 ifrtdump(0);
 376
 377         if (dflag == 0) {
 378 #if 1
 379                 if (daemon(0, 0) < 0) {
 380                         fatal("daemon");
 381                         /*NOTREACHED*/
 382                 }
 383 #else
 384                 if (fork())
 385                         exit(0);
 386                 if (setsid() < 0) {
 387                         fatal("setid");
 388                         /*NOTREACHED*/
 389                 }
 390 #endif
 391         }
 392         pid = getpid();
 393         if ((pidfile = fopen(ROUTE6D_PID, "w")) != NULL) {
 394                 fprintf(pidfile, "%d\n", pid);
 395                 fclose(pidfile);
 396         }
 397
 398         if ((ripbuf = (struct rip6 *)malloc(RIP6_MAXMTU)) == NULL) {
 399                 fatal("malloc");
 400                 /*NOTREACHED*/
 401         }
 402         memset(ripbuf, 0, RIP6_MAXMTU);
 403         ripbuf->rip6_cmd = RIP6_RESPONSE;
 404         ripbuf->rip6_vers = RIP6_VERSION;
 405         ripbuf->rip6_res1[0] = 0;
 406         ripbuf->rip6_res1[1] = 0;
 407
 408         if (signal(SIGALRM, sighandler) == SIG_ERR ||
 409             signal(SIGQUIT, sighandler) == SIG_ERR ||
 410             signal(SIGTERM, sighandler) == SIG_ERR ||
 411             signal(SIGUSR1, sighandler) == SIG_ERR ||
 412             signal(SIGHUP, sighandler) == SIG_ERR ||
 413             signal(SIGINT, sighandler) == SIG_ERR) {
 414                 fatal("signal");
 415                 /*NOTREACHED*/
 416         }
 417         /*
 418          * To avoid rip packet congestion (not on a cable but in this
 419          * process), wait for a moment to send the first RIP6_RESPONSE
 420          * packets.
 421          */
 422         alarm(ripinterval(INIT_INTERVAL6));
 423
 424         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 425                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 426                         sendrequest(ifcp);
 427         }
 428
 429         syslog(LOG_INFO, "**** Started ****");
 430         sigemptyset(&mask);
 431         sigaddset(&mask, SIGALRM);
 432         while (1) {
 433                 fd_set  recvec;
 434
 435                 if (seenalrm) {
 436                         ripalarm();
 437                         seenalrm = 0;
 438                         continue;
 439                 }
 440                 if (seenquit) {
 441                         rtdexit();
 442                         seenquit = 0;
 443                         continue;
 444                 }
 445                 if (seenusr1) {
 446                         ifrtdump(SIGUSR1);
 447                         seenusr1 = 0;
 448                         continue;
 449                 }
 450
 451                 FD_COPY(&sockvec, &recvec);
 452                 signo = 0;
 453                 switch (select(FD_SETSIZE, &recvec, 0, 0, 0)) {
 454                 case -1:
 455                         if (errno != EINTR) {
 456                                 fatal("select");
 457                                 /*NOTREACHED*/
 458                         }
 459                         continue;
 460                 case 0:
 461                         continue;
 462                 default:
 463                         if (FD_ISSET(ripsock, &recvec)) {
 464                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 465                                 riprecv();
 466                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 467                         }
 468                         if (FD_ISSET(rtsock, &recvec)) {
 469                                 sigprocmask(SIG_BLOCK, &mask, &omask);
 470                                 rtrecv();
 471                                 sigprocmask(SIG_SETMASK, &omask, NULL);
 472                         }
 473                 }
 474         }
 475 }
 476
 477 void
 478 sighandler(int sig)
 479 {
 480
 481         signo = sig;
 482         switch (signo) {
 483         case SIGALRM:
 484                 seenalrm++;
 485                 break;
 486         case SIGQUIT:
 487         case SIGTERM:
 488                 seenquit++;
 489                 break;
 490         case SIGUSR1:
 491         case SIGHUP:
 492         case SIGINT:
 493                 seenusr1++;
 494                 break;
 495         }
 496 }
 497
 498 /*
 499  * gracefully exits after resetting sockopts.
 500  */
 501 /* ARGSUSED */
 502 void
 503 rtdexit(void)
 504 {
 505         struct  riprt *rrt;
 506
 507         alarm(0);
 508         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 509                 if (rrt->rrt_rflags & RRTF_AGGREGATE) {
 510                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 511                 }
 512         }
 513         close(ripsock);
 514         close(rtsock);
 515         syslog(LOG_INFO, "**** Terminated ****");
 516         closelog();
 517         exit(1);
 518 }
 519
 520 /*
 521  * Called periodically:
 522  *      1. age out the learned route. remove it if necessary.
 523  *      2. submit RIP6_RESPONSE packets.
 524  * Invoked in every SUPPLY_INTERVAL6 (30) seconds.  I believe we don't have
 525  * to invoke this function in every 1 or 5 or 10 seconds only to age the
 526  * routes more precisely.
 527  */
 528 /* ARGSUSED */
 529 void
 530 ripalarm(void)
 531 {
 532         struct  ifc *ifcp;
 533         struct  riprt *rrt, *rrt_prev, *rrt_next;
 534         time_t  t_lifetime, t_holddown;
 535
 536         /* age the RIP routes */
 537         rrt_prev = NULL;
 538         t_lifetime = time(NULL) - RIP_LIFETIME;
 539         t_holddown = t_lifetime - RIP_HOLDDOWN;
 540         for (rrt = riprt; rrt; rrt = rrt_next) {
 541                 rrt_next = rrt->rrt_next;
 542
 543                 if (rrt->rrt_t == 0) {
 544                         rrt_prev = rrt;
 545                         continue;
 546                 }
 547                 if (rrt->rrt_t < t_holddown) {
 548                         if (rrt_prev) {
 549                                 rrt_prev->rrt_next = rrt->rrt_next;
 550                         } else {
 551                                 riprt = rrt->rrt_next;
 552                         }
 553                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
 554                         free(rrt);
 555                         continue;
 556                 }
 557                 if (rrt->rrt_t < t_lifetime)
 558                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
 559                 rrt_prev = rrt;
 560         }
 561         /* Supply updates */
 562         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
 563                 if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
 564                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
 565         }
 566         alarm(ripinterval(SUPPLY_INTERVAL6));
 567 }
 568
 569 void
 570 init(void)
 571 {
 572         int     i, int0, int255, error;
 573         struct  addrinfo hints, *res;
 574         char    port[10];
 575
 576         ifc = NULL;
 577         nifc = 0;
 578         nindex2ifc = 0; /*initial guess*/
 579         index2ifc = NULL;
 580         snprintf(port, sizeof(port), "%d", RIP6_PORT);
 581
 582         memset(&hints, 0, sizeof(hints));
 583         hints.ai_family = PF_INET6;
 584         hints.ai_socktype = SOCK_DGRAM;
 585         hints.ai_flags = AI_PASSIVE;
 586         error = getaddrinfo(NULL, port, &hints, &res);
 587         if (error) {
 588                 fatal("%s", gai_strerror(error));
 589                 /*NOTREACHED*/
 590         }
 591         if (res->ai_next) {
 592                 fatal(":: resolved to multiple address");
 593                 /*NOTREACHED*/
 594         }
 595
 596         int0 = 0; int255 = 255;
 597         ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
 598         if (ripsock < 0) {
 599                 fatal("rip socket");
 600                 /*NOTREACHED*/
 601         }
 602         if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
 603                 fatal("rip bind");
 604                 /*NOTREACHED*/
 605         }
 606         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
 607             &int255, sizeof(int255)) < 0) {
 608                 fatal("rip IPV6_MULTICAST_HOPS");
 609                 /*NOTREACHED*/
 610         }
 611         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
 612             &int0, sizeof(int0)) < 0) {
 613                 fatal("rip IPV6_MULTICAST_LOOP");
 614                 /*NOTREACHED*/
 615         }
 616
 617         i = 1;
 618 #ifdef IPV6_RECVPKTINFO
 619         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
 620             sizeof(i)) < 0) {
 621                 fatal("rip IPV6_RECVPKTINFO");
 622                 /*NOTREACHED*/
 623         }
 624 #else  /* old adv. API */
 625         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_PKTINFO, &i,
 626             sizeof(i)) < 0) {
 627                 fatal("rip IPV6_PKTINFO");
 628                 /*NOTREACHED*/
 629         }
 630 #endif
 631
 632         memset(&hints, 0, sizeof(hints));
 633         hints.ai_family = PF_INET6;
 634         hints.ai_socktype = SOCK_DGRAM;
 635         error = getaddrinfo(RIP6_DEST, port, &hints, &res);
 636         if (error) {
 637                 fatal("%s", gai_strerror(error));
 638                 /*NOTREACHED*/
 639         }
 640         if (res->ai_next) {
 641                 fatal("%s resolved to multiple address", RIP6_DEST);
 642                 /*NOTREACHED*/
 643         }
 644         memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
 645
 646 #ifdef FD_ZERO
 647         FD_ZERO(&sockvec);
 648 #else
 649         memset(&sockvec, 0, sizeof(sockvec));
 650 #endif
 651         FD_SET(ripsock, &sockvec);
 652
 653         if (nflag == 0) {
 654                 if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
 655                         fatal("route socket");
 656                         /*NOTREACHED*/
 657                 }
 658                 FD_SET(rtsock, &sockvec);
 659         } else
 660                 rtsock = -1;    /*just for safety */
 661 }
 662
 663 #define RIPSIZE(n) \
 664         (sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
 665
 666 /*
 667  * ripflush flushes the rip datagram stored in the rip buffer
 668  */
 669 static int nrt;
 670 static struct netinfo6 *np;
 671
 672 void
 673 ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin)
 674 {
 675         int i;
 676         int error;
 677
 678         if (ifcp)
 679                 tracet(1, "Send(%s): info(%d) to %s.%d\n",
 680                         ifcp->ifc_name, nrt,
 681                         inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
 682         else
 683                 tracet(1, "Send: info(%d) to %s.%d\n",
 684                         nrt, inet6_n2p(&sin->sin6_addr), ntohs(sin->sin6_port));
 685         if (dflag >= 2) {
 686                 np = ripbuf->rip6_nets;
 687                 for (i = 0; i < nrt; i++, np++) {
 688                         if (np->rip6_metric == NEXTHOP_METRIC) {
 689                                 if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
 690                                         trace(2, "    NextHop reset");
 691                                 else {
 692                                         trace(2, "    NextHop %s",
 693                                                 inet6_n2p(&np->rip6_dest));
 694                                 }
 695                         } else {
 696                                 trace(2, "    %s/%d[%d]",
 697                                         inet6_n2p(&np->rip6_dest),
 698                                         np->rip6_plen, np->rip6_metric);
 699                         }
 700                         if (np->rip6_tag) {
 701                                 trace(2, "  tag=0x%04x",
 702                                         ntohs(np->rip6_tag) & 0xffff);
 703                         }
 704                         trace(2, "\n");
 705                 }
 706         }
 707         error = sendpacket(sin, RIPSIZE(nrt));
 708         if (error == EAFNOSUPPORT) {
 709                 /* Protocol not supported */
 710                 tracet(1, "Could not send info to %s (%s): "
 711                         "set IFF_UP to 0\n",
 712                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
 713                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
 714         }
 715         nrt = 0; np = ripbuf->rip6_nets;
 716 }
 717
 718 /*
 719  * Generate RIP6_RESPONSE packets and send them.
 720  */
 721 void
 722 ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin, int flag)
 723 {
 724         struct  riprt *rrt;
 725         struct  in6_addr *nh;   /* next hop */
 726         int     maxrte;
 727
 728         if (ifcp == NULL) {
 729                 /*
 730                  * Request from non-link local address is not
 731                  * a regular route6d update.
 732                  */
 733                 maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
 734                                 sizeof(struct udphdr) -
 735                                 sizeof(struct rip6) + sizeof(struct netinfo6)) /
 736                                 sizeof(struct netinfo6);
 737                 nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 738                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 739                         if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 740                                 continue;
 741                         /* Put the route to the buffer */
 742                         *np = rrt->rrt_info;
 743                         np++; nrt++;
 744                         if (nrt == maxrte) {
 745                                 ripflush(NULL, sin);
 746                                 nh = NULL;
 747                         }
 748                 }
 749                 if (nrt)        /* Send last packet */
 750                         ripflush(NULL, sin);
 751                 return;
 752         }
 753
 754         if ((flag & RRTF_SENDANYWAY) == 0 &&
 755             (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
 756                 return;
 757
 758         /* -N: no use */
 759         if (iff_find(ifcp, 'N') != NULL)
 760                 return;
 761
 762         /* -T: generate default route only */
 763         if (iff_find(ifcp, 'T') != NULL) {
 764                 struct netinfo6 rrt_info;
 765                 memset(&rrt_info, 0, sizeof(struct netinfo6));
 766                 rrt_info.rip6_dest = in6addr_any;
 767                 rrt_info.rip6_plen = 0;
 768                 rrt_info.rip6_metric = 1;
 769                 rrt_info.rip6_metric += ifcp->ifc_metric;
 770                 rrt_info.rip6_tag = htons(routetag & 0xffff);
 771                 np = ripbuf->rip6_nets;
 772                 *np = rrt_info;
 773                 nrt = 1;
 774                 ripflush(ifcp, sin);
 775                 return;
 776         }
 777
 778         maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
 779                         sizeof(struct udphdr) -
 780                         sizeof(struct rip6) + sizeof(struct netinfo6)) /
 781                         sizeof(struct netinfo6);
 782
 783         nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
 784         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
 785                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
 786                         continue;
 787
 788                 /* Need to check filter here */
 789                 if (out_filter(rrt, ifcp) == 0)
 790                         continue;
 791
 792                 /* Check split horizon and other conditions */
 793                 if (tobeadv(rrt, ifcp) == 0)
 794                         continue;
 795
 796                 /* Only considers the routes with flag if specified */
 797                 if ((flag & RRTF_CHANGED) &&
 798                     (rrt->rrt_rflags & RRTF_CHANGED) == 0)
 799                         continue;
 800
 801                 /* Check nexthop */
 802                 if (rrt->rrt_index == ifcp->ifc_index &&
 803                     !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
 804                     (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
 805                         if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
 806                                 if (nrt == maxrte - 2)
 807                                         ripflush(ifcp, sin);
 808                                 np->rip6_dest = rrt->rrt_gw;
 809                                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
 810                                         SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
 811                                 np->rip6_plen = 0;
 812                                 np->rip6_tag = 0;
 813                                 np->rip6_metric = NEXTHOP_METRIC;
 814                                 nh = &rrt->rrt_gw;
 815                                 np++; nrt++;
 816                         }
 817                 } else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
 818                                   !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
 819                                   rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
 820                         /* Reset nexthop */
 821                         if (nrt == maxrte - 2)
 822                                 ripflush(ifcp, sin);
 823                         memset(np, 0, sizeof(struct netinfo6));
 824                         np->rip6_metric = NEXTHOP_METRIC;
 825                         nh = NULL;
 826                         np++; nrt++;
 827                 }
 828
 829                 /* Put the route to the buffer */
 830                 *np = rrt->rrt_info;
 831                 np++; nrt++;
 832                 if (nrt == maxrte) {
 833                         ripflush(ifcp, sin);
 834                         nh = NULL;
 835                 }
 836         }
 837         if (nrt)        /* Send last packet */
 838                 ripflush(ifcp, sin);
 839 }
 840
 841 /*
 842  * outbound filter logic, per-route/interface.
 843  */
 844 int
 845 out_filter(struct riprt *rrt, struct ifc *ifcp)
 846 {
 847         struct iff *iffp;
 848         struct in6_addr ia;
 849         int ok;
 850
 851         /*
 852          * -A: filter out less specific routes, if we have aggregated
 853          * route configured.
 854          */
 855         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 856                 if (iffp->iff_type != 'A')
 857                         continue;
 858                 if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
 859                         continue;
 860                 ia = rrt->rrt_info.rip6_dest;
 861                 applyplen(&ia, iffp->iff_plen);
 862                 if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
 863                         return 0;
 864         }
 865
 866         /*
 867          * if it is an aggregated route, advertise it only to the
 868          * interfaces specified on -A.
 869          */
 870         if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
 871                 ok = 0;
 872                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 873                         if (iffp->iff_type != 'A')
 874                                 continue;
 875                         if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
 876                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
 877                             &iffp->iff_addr)) {
 878                                 ok = 1;
 879                                 break;
 880                         }
 881                 }
 882                 if (!ok)
 883                         return 0;
 884         }
 885
 886         /*
 887          * -O: advertise only if prefix matches the configured prefix.
 888          */
 889         if (iff_find(ifcp, 'O')) {
 890                 ok = 0;
 891                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
 892                         if (iffp->iff_type != 'O')
 893                                 continue;
 894                         if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
 895                                 continue;
 896                         ia = rrt->rrt_info.rip6_dest;
 897                         applyplen(&ia, iffp->iff_plen);
 898                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
 899                                 ok = 1;
 900                                 break;
 901                         }
 902                 }
 903                 if (!ok)
 904                         return 0;
 905         }
 906
 907         /* the prefix should be advertised */
 908         return 1;
 909 }
 910
 911 /*
 912  * Determine if the route is to be advertised on the specified interface.
 913  * It checks options specified in the arguments and the split horizon rule.
 914  */
 915 int
 916 tobeadv(struct riprt *rrt, struct ifc *ifcp)
 917 {
 918
 919         /* Special care for static routes */
 920         if (rrt->rrt_flags & RTF_STATIC) {
 921                 /* XXX don't advertise reject/blackhole routes */
 922                 if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
 923                         return 0;
 924
 925                 if (Sflag)      /* Yes, advertise it anyway */
 926                         return 1;
 927                 if (sflag && rrt->rrt_index != ifcp->ifc_index)
 928                         return 1;
 929                 return 0;
 930         }
 931         /* Regular split horizon */
 932         if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
 933                 return 0;
 934         return 1;
 935 }
 936
 937 /*
 938  * Send a rip packet actually.
 939  */
 940 int
 941 sendpacket(struct sockaddr_in6 *sin, int len)
 942 {
 943         /*
 944          * MSG_DONTROUTE should not be specified when it responds with a
 945          * RIP6_REQUEST message.  SO_DONTROUTE has been specified to
 946          * other sockets.
 947          */
 948         struct msghdr m;
 949         struct cmsghdr *cm;
 950         struct iovec iov[2];
 951         u_char cmsgbuf[256];
 952         struct in6_pktinfo *pi;
 953         int idx;
 954         struct sockaddr_in6 sincopy;
 955
 956         /* do not overwrite the given sin */
 957         sincopy = *sin;
 958         sin = &sincopy;
 959
 960         if (IN6_IS_ADDR_LINKLOCAL(&sin->sin6_addr)
 961          || IN6_IS_ADDR_MULTICAST(&sin->sin6_addr)) {
 962                 idx = IN6_LINKLOCAL_IFINDEX(sin->sin6_addr);
 963                 SET_IN6_LINKLOCAL_IFINDEX(sin->sin6_addr, 0);
 964         } else
 965                 idx = 0;
 966
 967         m.msg_name = (caddr_t)sin;
 968         m.msg_namelen = sizeof(*sin);
 969         iov[0].iov_base = (caddr_t)ripbuf;
 970         iov[0].iov_len = len;
 971         m.msg_iov = iov;
 972         m.msg_iovlen = 1;
 973         if (!idx) {
 974                 m.msg_control = NULL;
 975                 m.msg_controllen = 0;
 976         } else {
 977                 memset(cmsgbuf, 0, sizeof(cmsgbuf));
 978                 cm = (struct cmsghdr *)cmsgbuf;
 979                 m.msg_control = (caddr_t)cm;
 980                 m.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
 981
 982                 cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
 983                 cm->cmsg_level = IPPROTO_IPV6;
 984                 cm->cmsg_type = IPV6_PKTINFO;
 985                 pi = (struct in6_pktinfo *)CMSG_DATA(cm);
 986                 memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
 987                 pi->ipi6_ifindex = idx;
 988         }
 989
 990         if (sendmsg(ripsock, &m, 0 /*MSG_DONTROUTE*/) < 0) {
 991                 trace(1, "sendmsg: %s\n", strerror(errno));
 992                 return errno;
 993         }
 994
 995         return 0;
 996 }
 997
 998 /*
 999  * Receive and process RIP packets.  Update the routes/kernel forwarding
1000  * table if necessary.
1001  */
1002 void
1003 riprecv(void)
1004 {
1005         struct  ifc *ifcp, *ic;
1006         struct  sockaddr_in6 fsock;
1007         struct  in6_addr nh;    /* next hop */
1008         struct  rip6 *rp;
1009         struct  netinfo6 *np, *nq;
1010         struct  riprt *rrt;
1011         int     len, nn, need_trigger, idx;
1012         char    buf[4 * RIP6_MAXMTU];
1013         time_t  t;
1014         struct msghdr m;
1015         struct cmsghdr *cm;
1016         struct iovec iov[2];
1017         u_char cmsgbuf[256];
1018         struct in6_pktinfo *pi;
1019         struct iff *iffp;
1020         struct in6_addr ia;
1021         int ok;
1022         time_t t_half_lifetime;
1023
1024         need_trigger = 0;
1025
1026         m.msg_name = (caddr_t)&fsock;
1027         m.msg_namelen = sizeof(fsock);
1028         iov[0].iov_base = (caddr_t)buf;
1029         iov[0].iov_len = sizeof(buf);
1030         m.msg_iov = iov;
1031         m.msg_iovlen = 1;
1032         cm = (struct cmsghdr *)cmsgbuf;
1033         m.msg_control = (caddr_t)cm;
1034         m.msg_controllen = sizeof(cmsgbuf);
1035         if ((len = recvmsg(ripsock, &m, 0)) < 0) {
1036                 fatal("recvmsg");
1037                 /*NOTREACHED*/
1038         }
1039         idx = 0;
1040         for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
1041              cm;
1042              cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
1043                 if (cm->cmsg_level == IPPROTO_IPV6 &&
1044                     cm->cmsg_type == IPV6_PKTINFO) {
1045                         pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
1046                         idx = pi->ipi6_ifindex;
1047                         break;
1048                 }
1049         }
1050         if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1051                 SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1052
1053         nh = fsock.sin6_addr;
1054         nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1055                 sizeof(struct netinfo6);
1056         rp = (struct rip6 *)buf;
1057         np = rp->rip6_nets;
1058
1059         if (rp->rip6_vers !=  RIP6_VERSION) {
1060                 trace(1, "Incorrect RIP version %d\n", rp->rip6_vers);
1061                 return;
1062         }
1063         if (rp->rip6_cmd == RIP6_REQUEST) {
1064                 if (idx && idx < nindex2ifc) {
1065                         ifcp = index2ifc[idx];
1066                         riprequest(ifcp, np, nn, &fsock);
1067                 } else {
1068                         riprequest(NULL, np, nn, &fsock);
1069                 }
1070                 return;
1071         }
1072
1073         if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1074                 trace(1, "Packets from non-ll addr: %s\n",
1075                     inet6_n2p(&fsock.sin6_addr));
1076                 return;         /* Ignore packets from non-link-local addr */
1077         }
1078         idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1079         ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1080         if (!ifcp) {
1081                 trace(1, "Packets to unknown interface index %d\n", idx);
1082                 return;         /* Ignore it */
1083         }
1084         if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1085                 return;         /* The packet is from me; ignore */
1086         if (rp->rip6_cmd != RIP6_RESPONSE) {
1087                 trace(1, "Invalid command %d\n", rp->rip6_cmd);
1088                 return;
1089         }
1090
1091         /* -N: no use */
1092         if (iff_find(ifcp, 'N') != NULL)
1093                 return;
1094
1095         tracet(1, "Recv(%s): from %s.%d info(%d)\n",
1096             ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1097
1098         t = time(NULL);
1099         t_half_lifetime = t - (RIP_LIFETIME/2);
1100         for (; nn; nn--, np++) {
1101                 if (np->rip6_metric == NEXTHOP_METRIC) {
1102                         /* modify neighbor address */
1103                         if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1104                                 nh = np->rip6_dest;
1105                                 SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1106                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1107                         } else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1108                                 nh = fsock.sin6_addr;
1109                                 trace(1, "\tNexthop: %s\n", inet6_n2p(&nh));
1110                         } else {
1111                                 nh = fsock.sin6_addr;
1112                                 trace(1, "\tInvalid Nexthop: %s\n",
1113                                     inet6_n2p(&np->rip6_dest));
1114                         }
1115                         continue;
1116                 }
1117                 if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1118                         trace(1, "\tMulticast netinfo6: %s/%d [%d]\n",
1119                                 inet6_n2p(&np->rip6_dest),
1120                                 np->rip6_plen, np->rip6_metric);
1121                         continue;
1122                 }
1123                 if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1124                         trace(1, "\tLoopback netinfo6: %s/%d [%d]\n",
1125                                 inet6_n2p(&np->rip6_dest),
1126                                 np->rip6_plen, np->rip6_metric);
1127                         continue;
1128                 }
1129                 if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1130                         trace(1, "\tLink Local netinfo6: %s/%d [%d]\n",
1131                                 inet6_n2p(&np->rip6_dest),
1132                                 np->rip6_plen, np->rip6_metric);
1133                         continue;
1134                 }
1135                 /* may need to pass sitelocal prefix in some case, however*/
1136                 if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1137                         trace(1, "\tSite Local netinfo6: %s/%d [%d]\n",
1138                                 inet6_n2p(&np->rip6_dest),
1139                                 np->rip6_plen, np->rip6_metric);
1140                         continue;
1141                 }
1142                 trace(2, "\tnetinfo6: %s/%d [%d]",
1143                         inet6_n2p(&np->rip6_dest),
1144                         np->rip6_plen, np->rip6_metric);
1145                 if (np->rip6_tag)
1146                         trace(2, "  tag=0x%04x", ntohs(np->rip6_tag) & 0xffff);
1147                 if (dflag >= 2) {
1148                         ia = np->rip6_dest;
1149                         applyplen(&ia, np->rip6_plen);
1150                         if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1151                                 trace(2, " [junk outside prefix]");
1152                 }
1153
1154                 /*
1155                  * -L: listen only if the prefix matches the configuration
1156                  */
1157                 ok = 1;         /* if there's no L filter, it is ok */
1158                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1159                         if (iffp->iff_type != 'L')
1160                                 continue;
1161                         ok = 0;
1162                         if (np->rip6_plen < iffp->iff_plen)
1163                                 continue;
1164                         /* special rule: ::/0 means default, not "in /0" */
1165                         if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1166                                 continue;
1167                         ia = np->rip6_dest;
1168                         applyplen(&ia, iffp->iff_plen);
1169                         if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1170                                 ok = 1;
1171                                 break;
1172                         }
1173                 }
1174                 if (!ok) {
1175                         trace(2, "  (filtered)\n");
1176                         continue;
1177                 }
1178
1179                 trace(2, "\n");
1180                 np->rip6_metric++;
1181                 np->rip6_metric += ifcp->ifc_metric;
1182                 if (np->rip6_metric > HOPCNT_INFINITY6)
1183                         np->rip6_metric = HOPCNT_INFINITY6;
1184
1185                 applyplen(&np->rip6_dest, np->rip6_plen);
1186                 if ((rrt = rtsearch(np, NULL)) != NULL) {
1187                         if (rrt->rrt_t == 0)
1188                                 continue;       /* Intf route has priority */
1189                         nq = &rrt->rrt_info;
1190                         if (nq->rip6_metric > np->rip6_metric) {
1191                                 if (rrt->rrt_index == ifcp->ifc_index &&
1192                                     IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1193                                         /* Small metric from the same gateway */
1194                                         nq->rip6_metric = np->rip6_metric;
1195                                 } else {
1196                                         /* Better route found */
1197                                         rrt->rrt_index = ifcp->ifc_index;
1198                                         /* Update routing table */
1199                                         delroute(nq, &rrt->rrt_gw);
1200                                         rrt->rrt_gw = nh;
1201                                         *nq = *np;
1202                                         addroute(rrt, &nh, ifcp);
1203                                 }
1204                                 rrt->rrt_rflags |= RRTF_CHANGED;
1205                                 rrt->rrt_t = t;
1206                                 need_trigger = 1;
1207                         } else if (nq->rip6_metric < np->rip6_metric &&
1208                                    rrt->rrt_index == ifcp->ifc_index &&
1209                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1210                                 /* Got worse route from same gw */
1211                                 nq->rip6_metric = np->rip6_metric;
1212                                 rrt->rrt_t = t;
1213                                 rrt->rrt_rflags |= RRTF_CHANGED;
1214                                 need_trigger = 1;
1215                         } else if (nq->rip6_metric == np->rip6_metric &&
1216                                    np->rip6_metric < HOPCNT_INFINITY6) {
1217                                 if (rrt->rrt_index == ifcp->ifc_index &&
1218                                    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1219                                         /* same metric, same route from same gw */
1220                                         rrt->rrt_t = t;
1221                                 } else if (rrt->rrt_t < t_half_lifetime) {
1222                                         /* Better route found */
1223                                         rrt->rrt_index = ifcp->ifc_index;
1224                                         /* Update routing table */
1225                                         delroute(nq, &rrt->rrt_gw);
1226                                         rrt->rrt_gw = nh;
1227                                         *nq = *np;
1228                                         addroute(rrt, &nh, ifcp);
1229                                         rrt->rrt_rflags |= RRTF_CHANGED;
1230                                         rrt->rrt_t = t;
1231                                 }
1232                         }
1233                         /*
1234                          * if nq->rip6_metric == HOPCNT_INFINITY6 then
1235                          * do not update age value.  Do nothing.
1236                          */
1237                 } else if (np->rip6_metric < HOPCNT_INFINITY6) {
1238                         /* Got a new valid route */
1239                         if ((rrt = MALLOC(struct riprt)) == NULL) {
1240                                 fatal("malloc: struct riprt");
1241                                 /*NOTREACHED*/
1242                         }
1243                         memset(rrt, 0, sizeof(*rrt));
1244                         nq = &rrt->rrt_info;
1245
1246                         rrt->rrt_same = NULL;
1247                         rrt->rrt_index = ifcp->ifc_index;
1248                         rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1249                         rrt->rrt_gw = nh;
1250                         *nq = *np;
1251                         applyplen(&nq->rip6_dest, nq->rip6_plen);
1252                         if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1253                                 rrt->rrt_flags |= RTF_HOST;
1254
1255                         /* Put the route to the list */
1256                         rrt->rrt_next = riprt;
1257                         riprt = rrt;
1258                         /* Update routing table */
1259                         addroute(rrt, &nh, ifcp);
1260                         rrt->rrt_rflags |= RRTF_CHANGED;
1261                         need_trigger = 1;
1262                         rrt->rrt_t = t;
1263                 }
1264         }
1265         /* XXX need to care the interval between triggered updates */
1266         if (need_trigger) {
1267                 if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1268                         for (ic = ifc; ic; ic = ic->ifc_next) {
1269                                 if (ifcp->ifc_index == ic->ifc_index)
1270                                         continue;
1271                                 if (ic->ifc_flags & IFF_UP)
1272                                         ripsend(ic, &ic->ifc_ripsin,
1273                                                 RRTF_CHANGED);
1274                         }
1275                 }
1276                 /* Reset the flag */
1277                 for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1278                         rrt->rrt_rflags &= ~RRTF_CHANGED;
1279         }
1280 }
1281
1282 /*
1283  * Send all routes request packet to the specified interface.
1284  */
1285 void
1286 sendrequest(struct ifc *ifcp)
1287 {
1288         struct netinfo6 *np;
1289         int error;
1290
1291         if (ifcp->ifc_flags & IFF_LOOPBACK)
1292                 return;
1293         ripbuf->rip6_cmd = RIP6_REQUEST;
1294         np = ripbuf->rip6_nets;
1295         memset(np, 0, sizeof(struct netinfo6));
1296         np->rip6_metric = HOPCNT_INFINITY6;
1297         tracet(1, "Send rtdump Request to %s (%s)\n",
1298                 ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1299         error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1300         if (error == EAFNOSUPPORT) {
1301                 /* Protocol not supported */
1302                 tracet(1, "Could not send rtdump Request to %s (%s): "
1303                         "set IFF_UP to 0\n",
1304                         ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1305                 ifcp->ifc_flags &= ~IFF_UP;     /* As if down for AF_INET6 */
1306         }
1307         ripbuf->rip6_cmd = RIP6_RESPONSE;
1308 }
1309
1310 /*
1311  * Process a RIP6_REQUEST packet.
1312  */
1313 void
1314 riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
1315            struct sockaddr_in6 *sin)
1316 {
1317         int i;
1318         struct riprt *rrt;
1319
1320         if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1321               np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1322                 /* Specific response, don't split-horizon */
1323                 trace(1, "\tRIP Request\n");
1324                 for (i = 0; i < nn; i++, np++) {
1325                         rrt = rtsearch(np, NULL);
1326                         if (rrt)
1327                                 np->rip6_metric = rrt->rrt_info.rip6_metric;
1328                         else
1329                                 np->rip6_metric = HOPCNT_INFINITY6;
1330                 }
1331                 sendpacket(sin, RIPSIZE(nn));
1332                 return;
1333         }
1334         /* Whole routing table dump */
1335         trace(1, "\tRIP Request -- whole routing table\n");
1336         ripsend(ifcp, sin, RRTF_SENDANYWAY);
1337 }
1338
1339 /*
1340  * Get information of each interface.
1341  */
1342 void
1343 ifconfig(void)
1344 {
1345         struct ifaddrs *ifap, *ifa;
1346         struct ifc *ifcp;
1347         struct ipv6_mreq mreq;
1348         int s;
1349
1350         if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1351                 fatal("socket");
1352                 /*NOTREACHED*/
1353         }
1354
1355         if (getifaddrs(&ifap) != 0) {
1356                 fatal("getifaddrs");
1357                 /*NOTREACHED*/
1358         }
1359
1360         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1361                 if (ifa->ifa_addr->sa_family != AF_INET6)
1362                         continue;
1363                 ifcp = ifc_find(ifa->ifa_name);
1364                 /* we are interested in multicast-capable interfaces */
1365                 if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1366                         continue;
1367                 if (!ifcp) {
1368                         /* new interface */
1369                         if ((ifcp = MALLOC(struct ifc)) == NULL) {
1370                                 fatal("malloc: struct ifc");
1371                                 /*NOTREACHED*/
1372                         }
1373                         memset(ifcp, 0, sizeof(*ifcp));
1374                         ifcp->ifc_index = -1;
1375                         ifcp->ifc_next = ifc;
1376                         ifc = ifcp;
1377                         nifc++;
1378                         ifcp->ifc_name = allocopy(ifa->ifa_name);
1379                         ifcp->ifc_addr = NULL;
1380                         ifcp->ifc_filter = NULL;
1381                         ifcp->ifc_flags = ifa->ifa_flags;
1382                         trace(1, "newif %s <%s>\n", ifcp->ifc_name,
1383                                 ifflags(ifcp->ifc_flags));
1384                         if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1385                                 loopifcp = ifcp;
1386                 } else {
1387                         /* update flag, this may be up again */
1388                         if (ifcp->ifc_flags != ifa->ifa_flags) {
1389                                 trace(1, "%s: <%s> -> ", ifcp->ifc_name,
1390                                         ifflags(ifcp->ifc_flags));
1391                                 trace(1, "<%s>\n", ifflags(ifa->ifa_flags));
1392                                 ifcp->ifc_cflags |= IFC_CHANGED;
1393                         }
1394                         ifcp->ifc_flags = ifa->ifa_flags;
1395                 }
1396                 ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1397                 if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1398                  && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1399                         mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1400                         mreq.ipv6mr_interface = ifcp->ifc_index;
1401                         if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1402                             &mreq, sizeof(mreq)) < 0) {
1403                                 fatal("IPV6_JOIN_GROUP");
1404                                 /*NOTREACHED*/
1405                         }
1406                         trace(1, "join %s %s\n", ifcp->ifc_name, RIP6_DEST);
1407                         ifcp->ifc_joined++;
1408                 }
1409         }
1410         close(s);
1411         freeifaddrs(ifap);
1412 }
1413
1414 void
1415 ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
1416 {
1417         struct  in6_ifreq ifr;
1418         const struct sockaddr_in6 *sin;
1419         struct  ifac *ifa;
1420         int     plen;
1421         char    buf[BUFSIZ];
1422
1423         sin = (const struct sockaddr_in6 *)sa;
1424         ifr.ifr_addr = *sin;
1425         strcpy(ifr.ifr_name, name);
1426         if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1427                 fatal("ioctl: SIOCGIFNETMASK_IN6");
1428                 /*NOTREACHED*/
1429         }
1430         plen = sin6mask2len(&ifr.ifr_addr);
1431         if ((ifa = ifa_match(ifcp, &sin->sin6_addr, plen)) != NULL) {
1432                 /* same interface found */
1433                 /* need check if something changed */
1434                 /* XXX not yet implemented */
1435                 return;
1436         }
1437         /*
1438          * New address is found
1439          */
1440         if ((ifa = MALLOC(struct ifac)) == NULL) {
1441                 fatal("malloc: struct ifac");
1442                 /*NOTREACHED*/
1443         }
1444         memset(ifa, 0, sizeof(*ifa));
1445         ifa->ifa_conf = ifcp;
1446         ifa->ifa_next = ifcp->ifc_addr;
1447         ifcp->ifc_addr = ifa;
1448         ifa->ifa_addr = sin->sin6_addr;
1449         ifa->ifa_plen = plen;
1450         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1451                 ifr.ifr_addr = *sin;
1452                 if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1453                         fatal("ioctl: SIOCGIFDSTADDR_IN6");
1454                         /*NOTREACHED*/
1455                 }
1456                 ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1457                 inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1458                 trace(1, "found address %s/%d -- %s\n",
1459                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1460         } else {
1461                 trace(1, "found address %s/%d\n",
1462                         inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1463         }
1464         if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1465                 ifcp->ifc_mylladdr = ifa->ifa_addr;
1466                 ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1467                 memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1468                 SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1469                         ifcp->ifc_index);
1470                 setindex2ifc(ifcp->ifc_index, ifcp);
1471                 ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1472                 if (ifcp->ifc_mtu > RIP6_MAXMTU)
1473                         ifcp->ifc_mtu = RIP6_MAXMTU;
1474                 if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1475                         fatal("ioctl: SIOCGIFMETRIC");
1476                         /*NOTREACHED*/
1477                 }
1478                 ifcp->ifc_metric = ifr.ifr_metric;
1479                 trace(1, "\tindex: %d, mtu: %d, metric: %d\n",
1480                         ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1481         } else
1482                 ifcp->ifc_cflags |= IFC_CHANGED;
1483 }
1484
1485 /*
1486  * Receive and process routing messages.
1487  * Update interface information as necesssary.
1488  */
1489 void
1490 rtrecv(void)
1491 {
1492         char buf[BUFSIZ];
1493         char *p, *q;
1494         struct rt_msghdr *rtm;
1495         struct ifa_msghdr *ifam;
1496         struct if_msghdr *ifm;
1497         int len;
1498         struct ifc *ifcp, *ic;
1499         int iface = 0, rtable = 0;
1500         struct sockaddr_in6 *rta[RTAX_MAX];
1501         struct sockaddr_in6 mask;
1502         int i, addrs;
1503         struct riprt *rrt;
1504
1505         if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1506                 perror("read from rtsock");
1507                 exit(1);
1508         }
1509         if (len < sizeof(*rtm)) {
1510                 trace(1, "short read from rtsock: %d (should be > %lu)\n",
1511                         len, (u_long)sizeof(*rtm));
1512                 return;
1513         }
1514
1515         for (p = buf; p - buf < len; p += ((struct rt_msghdr *)p)->rtm_msglen) {
1516                 /* safety against bogus message */
1517                 if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1518                         trace(1, "bogus rtmsg: length=%d\n",
1519                                 ((struct rt_msghdr *)p)->rtm_msglen);
1520                         break;
1521                 }
1522                 rtm = NULL;
1523                 ifam = NULL;
1524                 ifm = NULL;
1525                 switch (((struct rt_msghdr *)p)->rtm_type) {
1526                 case RTM_NEWADDR:
1527                 case RTM_DELADDR:
1528                         ifam = (struct ifa_msghdr *)p;
1529                         addrs = ifam->ifam_addrs;
1530                         q = (char *)(ifam + 1);
1531                         break;
1532                 case RTM_IFINFO:
1533                         ifm = (struct if_msghdr *)p;
1534                         addrs = ifm->ifm_addrs;
1535                         q = (char *)(ifm + 1);
1536                         break;
1537                 default:
1538                         rtm = (struct rt_msghdr *)p;
1539                         addrs = rtm->rtm_addrs;
1540                         q = (char *)(rtm + 1);
1541                         if (rtm->rtm_version != RTM_VERSION) {
1542                                 trace(1, "unexpected rtmsg version %d "
1543                                         "(should be %d)\n",
1544                                         rtm->rtm_version, RTM_VERSION);
1545                                 continue;
1546                         }
1547                         if (rtm->rtm_pid == pid) {
1548 #if 0
1549                                 trace(1, "rtmsg looped back to me, ignored\n");
1550 #endif
1551                                 continue;
1552                         }
1553                         break;
1554                 }
1555                 memset(&rta, 0, sizeof(rta));
1556                 for (i = 0; i < RTAX_MAX; i++) {
1557                         if (addrs & (1 << i)) {
1558                                 rta[i] = (struct sockaddr_in6 *)q;
1559                                 q += ROUNDUP(rta[i]->sin6_len);
1560                         }
1561                 }
1562
1563                 trace(1, "rtsock: %s (addrs=%x)\n",
1564                         rttypes((struct rt_msghdr *)p), addrs);
1565                 if (dflag >= 2) {
1566                         for (i = 0;
1567                              i < ((struct rt_msghdr *)p)->rtm_msglen;
1568                              i++) {
1569                                 fprintf(stderr, "%02x ", p[i] & 0xff);
1570                                 if (i % 16 == 15) fprintf(stderr, "\n");
1571                         }
1572                         fprintf(stderr, "\n");
1573                 }
1574
1575                 /*
1576                  * Easy ones first.
1577                  *
1578                  * We may be able to optimize by using ifm->ifm_index or
1579                  * ifam->ifam_index.  For simplicity we don't do that here.
1580                  */
1581                 switch (((struct rt_msghdr *)p)->rtm_type) {
1582                 case RTM_NEWADDR:
1583                 case RTM_IFINFO:
1584                         iface++;
1585                         continue;
1586                 case RTM_ADD:
1587                         rtable++;
1588                         continue;
1589                 case RTM_LOSING:
1590                 case RTM_MISS:
1591                 case RTM_RESOLVE:
1592                 case RTM_GET:
1593                 case RTM_LOCK:
1594                         /* nothing to be done here */
1595                         trace(1, "\tnothing to be done, ignored\n");
1596                         continue;
1597                 }
1598
1599 #if 0
1600                 if (rta[RTAX_DST] == NULL) {
1601                         trace(1, "\tno destination, ignored\n");
1602                         continue;
1603                 }
1604                 if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1605                         trace(1, "\taf mismatch, ignored\n");
1606                         continue;
1607                 }
1608                 if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1609                         trace(1, "\tlinklocal destination, ignored\n");
1610                         continue;
1611                 }
1612                 if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1613                         trace(1, "\tloopback destination, ignored\n");
1614                         continue;               /* Loopback */
1615                 }
1616                 if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1617                         trace(1, "\tmulticast destination, ignored\n");
1618                         continue;
1619                 }
1620 #endif
1621
1622                 /* hard ones */
1623                 switch (((struct rt_msghdr *)p)->rtm_type) {
1624                 case RTM_NEWADDR:
1625                 case RTM_IFINFO:
1626                 case RTM_ADD:
1627                 case RTM_LOSING:
1628                 case RTM_MISS:
1629                 case RTM_RESOLVE:
1630                 case RTM_GET:
1631                 case RTM_LOCK:
1632                         /* should already be handled */
1633                         fatal("rtrecv: never reach here");
1634                         /*NOTREACHED*/
1635                 case RTM_DELETE:
1636                         if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1637                                 trace(1, "\tsome of dst/gw/netamsk are "
1638                                     "unavailable, ignored\n");
1639                                 break;
1640                         }
1641                         if ((rtm->rtm_flags & RTF_HOST) != 0) {
1642                                 mask.sin6_len = sizeof(mask);
1643                                 memset(&mask.sin6_addr, 0xff,
1644                                     sizeof(mask.sin6_addr));
1645                                 rta[RTAX_NETMASK] = &mask;
1646                         } else if (!rta[RTAX_NETMASK]) {
1647                                 trace(1, "\tsome of dst/gw/netamsk are "
1648                                     "unavailable, ignored\n");
1649                                 break;
1650                         }
1651                         if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1652                             rta[RTAX_NETMASK]) == 0) {
1653                                 rtable++;       /*just to be sure*/
1654                         }
1655                         break;
1656                 case RTM_CHANGE:
1657                 case RTM_REDIRECT:
1658                         trace(1, "\tnot supported yet, ignored\n");
1659                         break;
1660                 case RTM_DELADDR:
1661                         if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1662                                 trace(1, "\tno netmask or ifa given, ignored\n");
1663                                 break;
1664                         }
1665                         if (ifam->ifam_index < nindex2ifc)
1666                                 ifcp = index2ifc[ifam->ifam_index];
1667                         else
1668                                 ifcp = NULL;
1669                         if (!ifcp) {
1670                                 trace(1, "\tinvalid ifam_index %d, ignored\n",
1671                                         ifam->ifam_index);
1672                                 break;
1673                         }
1674                         if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1675                                 iface++;
1676                         break;
1677                 case RTM_OLDADD:
1678                 case RTM_OLDDEL:
1679                         trace(1, "\tnot supported yet, ignored\n");
1680                         break;
1681                 }
1682
1683         }
1684
1685         if (iface) {
1686                 trace(1, "rtsock: reconfigure interfaces, refresh interface routes\n");
1687                 ifconfig();
1688                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1689                         if (ifcp->ifc_cflags & IFC_CHANGED) {
1690                                 if (ifrt(ifcp, 1)) {
1691                                         for (ic = ifc; ic; ic = ic->ifc_next) {
1692                                                 if (ifcp->ifc_index == ic->ifc_index)
1693                                                         continue;
1694                                                 if (ic->ifc_flags & IFF_UP)
1695                                                         ripsend(ic, &ic->ifc_ripsin,
1696                                                         RRTF_CHANGED);
1697                                         }
1698                                         /* Reset the flag */
1699                                         for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1700                                                 rrt->rrt_rflags &= ~RRTF_CHANGED;
1701                                 }
1702                                 ifcp->ifc_cflags &= ~IFC_CHANGED;
1703                         }
1704         }
1705         if (rtable) {
1706                 trace(1, "rtsock: read routing table again\n");
1707                 krtread(1);
1708         }
1709 }
1710
1711 /*
1712  * remove specified route from the internal routing table.
1713  */
1714 int
1715 rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
1716        const struct sockaddr_in6 *smask)
1717 {
1718         const struct in6_addr *dst = NULL;
1719         const struct in6_addr *gw = NULL;
1720         int prefix;
1721         struct netinfo6 ni6;
1722         struct riprt *rrt = NULL;
1723         time_t t_lifetime;
1724
1725         if (sdst->sin6_family != AF_INET6) {
1726                 trace(1, "\tother AF, ignored\n");
1727                 return -1;
1728         }
1729         if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1730          || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1731          || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1732                 trace(1, "\taddress %s not interesting, ignored\n",
1733                         inet6_n2p(&sdst->sin6_addr));
1734                 return -1;
1735         }
1736         dst = &sdst->sin6_addr;
1737         if (sgw->sin6_family == AF_INET6) {
1738                 /* easy case */
1739                 gw = &sgw->sin6_addr;
1740                 prefix = sin6mask2len(smask);
1741         } else if (sgw->sin6_family == AF_LINK) {
1742                 /*
1743                  * Interface route... a hard case.  We need to get the prefix
1744                  * length from the kernel, but we now are parsing rtmsg.
1745                  * We'll purge matching routes from my list, then get the
1746                  * fresh list.
1747                  */
1748                 struct riprt *longest;
1749                 trace(1, "\t%s is a interface route, guessing prefixlen\n",
1750                         inet6_n2p(dst));
1751                 longest = NULL;
1752                 for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1753                         if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1754                                         &sdst->sin6_addr)
1755                          && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1756                                 if (!longest
1757                                  || longest->rrt_info.rip6_plen <
1758                                                  rrt->rrt_info.rip6_plen) {
1759                                         longest = rrt;
1760                                 }
1761                         }
1762                 }
1763                 rrt = longest;
1764                 if (!rrt) {
1765                         trace(1, "\tno matching interface route found\n");
1766                         return -1;
1767                 }
1768                 gw = &in6addr_loopback;
1769                 prefix = rrt->rrt_info.rip6_plen;
1770         } else {
1771                 trace(1, "\tunsupported af: (gw=%d)\n", sgw->sin6_family);
1772                 return -1;
1773         }
1774
1775         trace(1, "\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1776         trace(1, "gw %s\n", inet6_n2p(gw));
1777         t_lifetime = time(NULL) - RIP_LIFETIME;
1778         /* age route for interface address */
1779         memset(&ni6, 0, sizeof(ni6));
1780         ni6.rip6_dest = *dst;
1781         ni6.rip6_plen = prefix;
1782         applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1783         trace(1, "\tfind route %s/%d\n", inet6_n2p(&ni6.rip6_dest),
1784                 ni6.rip6_plen);
1785         if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1786                 trace(1, "\tno route found\n");
1787                 return -1;
1788         }
1789 #if 0
1790         if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1791                 trace(1, "\tyou can delete static routes only\n");
1792         } else
1793 #endif
1794         if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1795                 trace(1, "\tgw mismatch: %s <-> ",
1796                         inet6_n2p(&rrt->rrt_gw));
1797                 trace(1, "%s\n", inet6_n2p(gw));
1798         } else {
1799                 trace(1, "\troute found, age it\n");
1800                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1801                         rrt->rrt_t = t_lifetime;
1802                         rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1803                 }
1804         }
1805         return 0;
1806 }
1807
1808 /*
1809  * remove specified address from internal interface/routing table.
1810  */
1811 int
1812 rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
1813            const struct sockaddr_in6 *smask)
1814 {
1815         const struct in6_addr *addr = NULL;
1816         int prefix;
1817         struct ifac *ifa = NULL;
1818         struct netinfo6 ni6;
1819         struct riprt *rrt = NULL;
1820         time_t t_lifetime;
1821         int updated = 0;
1822
1823         if (sifa->sin6_family != AF_INET6) {
1824                 trace(1, "\tother AF, ignored\n");
1825                 return -1;
1826         }
1827         addr = &sifa->sin6_addr;
1828         prefix = sin6mask2len(smask);
1829
1830         trace(1, "\tdeleting %s/%d from %s\n",
1831                 inet6_n2p(addr), prefix, ifcp->ifc_name);
1832         ifa = ifa_match(ifcp, addr, prefix);
1833         if (!ifa) {
1834                 trace(1, "\tno matching ifa found for %s/%d on %s\n",
1835                         inet6_n2p(addr), prefix, ifcp->ifc_name);
1836                 return -1;
1837         }
1838         if (ifa->ifa_conf != ifcp) {
1839                 trace(1, "\taddress table corrupt: back pointer does not match "
1840                         "(%s != %s)\n",
1841                         ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1842                 return -1;
1843         }
1844         /* remove ifa from interface */
1845         if (ifcp->ifc_addr == ifa)
1846                 ifcp->ifc_addr = ifa->ifa_next;
1847         else {
1848                 struct ifac *p;
1849                 for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1850                         if (p->ifa_next == ifa) {
1851                                 p->ifa_next = ifa->ifa_next;
1852                                 break;
1853                         }
1854                 }
1855         }
1856         ifa->ifa_next = NULL;
1857         ifa->ifa_conf = NULL;
1858         t_lifetime = time(NULL) - RIP_LIFETIME;
1859         /* age route for interface address */
1860         memset(&ni6, 0, sizeof(ni6));
1861         ni6.rip6_dest = ifa->ifa_addr;
1862         ni6.rip6_plen = ifa->ifa_plen;
1863         applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1864         trace(1, "\tfind interface route %s/%d on %d\n",
1865                 inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1866         if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1867                 struct in6_addr none;
1868                 memset(&none, 0, sizeof(none));
1869                 if (rrt->rrt_index == ifcp->ifc_index &&
1870                     (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1871                      IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1872                         trace(1, "\troute found, age it\n");
1873                         if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1874                                 rrt->rrt_t = t_lifetime;
1875                                 rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1876                         }
1877                         updated++;
1878                 } else {
1879                         trace(1, "\tnon-interface route found: %s/%d on %d\n",
1880                                 inet6_n2p(&rrt->rrt_info.rip6_dest),
1881                                 rrt->rrt_info.rip6_plen,
1882                                 rrt->rrt_index);
1883                 }
1884         } else
1885                 trace(1, "\tno interface route found\n");
1886         /* age route for p2p destination */
1887         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1888                 memset(&ni6, 0, sizeof(ni6));
1889                 ni6.rip6_dest = ifa->ifa_raddr;
1890                 ni6.rip6_plen = 128;
1891                 applyplen(&ni6.rip6_dest, ni6.rip6_plen);       /*to be sure*/
1892                 trace(1, "\tfind p2p route %s/%d on %d\n",
1893                         inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1894                         ifcp->ifc_index);
1895                 if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1896                         if (rrt->rrt_index == ifcp->ifc_index &&
1897                             IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1898                                 trace(1, "\troute found, age it\n");
1899                                 if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1900                                         rrt->rrt_t = t_lifetime;
1901                                         rrt->rrt_info.rip6_metric =
1902                                             HOPCNT_INFINITY6;
1903                                         updated++;
1904                                 }
1905                         } else {
1906                                 trace(1, "\tnon-p2p route found: %s/%d on %d\n",
1907                                         inet6_n2p(&rrt->rrt_info.rip6_dest),
1908                                         rrt->rrt_info.rip6_plen,
1909                                         rrt->rrt_index);
1910                         }
1911                 } else
1912                         trace(1, "\tno p2p route found\n");
1913         }
1914         return updated ? 0 : -1;
1915 }
1916
1917 /*
1918  * Get each interface address and put those interface routes to the route
1919  * list.
1920  */
1921 int
1922 ifrt(struct ifc *ifcp, int again)
1923 {
1924         struct ifac *ifa;
1925         struct riprt *rrt, *search_rrt, *prev_rrt, *loop_rrt;
1926         struct netinfo6 *np;
1927         time_t t_lifetime;
1928         int need_trigger = 0;
1929
1930         if (ifcp->ifc_flags & IFF_LOOPBACK)
1931                 return 0;                       /* ignore loopback */
1932         if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1933                 ifrt_p2p(ifcp, again);
1934                 return 0;
1935         }
1936
1937         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1938                 if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1939 #if 0
1940                         trace(1, "route: %s on %s: "
1941                             "skip linklocal interface address\n",
1942                             inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1943 #endif
1944                         continue;
1945                 }
1946                 if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1947 #if 0
1948                         trace(1, "route: %s: skip unspec interface address\n",
1949                             ifcp->ifc_name);
1950 #endif
1951                         continue;
1952                 }
1953                 if (ifcp->ifc_flags & IFF_UP) {
1954                         if ((rrt = MALLOC(struct riprt)) == NULL)
1955                                 fatal("malloc: struct riprt");
1956                         memset(rrt, 0, sizeof(*rrt));
1957                         rrt->rrt_same = NULL;
1958                         rrt->rrt_index = ifcp->ifc_index;
1959                         rrt->rrt_t = 0; /* don't age */
1960                         rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1961                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1962                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1963                         rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1964                         rrt->rrt_flags = RTF_CLONING;
1965                         rrt->rrt_rflags |= RRTF_CHANGED;
1966                         applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
1967                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
1968 #if 0
1969                         /* XXX why gateway address == network adddress? */
1970                         rrt->rrt_gw = ifa->ifa_addr;
1971 #endif
1972                         np = &rrt->rrt_info;
1973                         search_rrt = rtsearch(np, &prev_rrt);
1974                         if (search_rrt != NULL) {
1975                                 if (search_rrt->rrt_info.rip6_metric >
1976                                     rrt->rrt_info.rip6_metric) {
1977                                         if (prev_rrt)
1978                                                 prev_rrt->rrt_next = rrt->rrt_next;
1979                                         else
1980                                                 riprt = rrt->rrt_next;
1981                                         delroute(&rrt->rrt_info, &rrt->rrt_gw);
1982                                         free(rrt);
1983                                 } else {
1984                                         /* Already have better route */
1985                                         if (!again) {
1986                                                 trace(1, "route: %s/%d: "
1987                                                     "already registered (%s)\n",
1988                                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
1989                                                     ifcp->ifc_name);
1990                                         }
1991                                         free(rrt);
1992                                         continue;
1993                                 }
1994                         }
1995                         /* Attach the route to the list */
1996                         trace(1, "route: %s/%d: register route (%s)\n",
1997                             inet6_n2p(&np->rip6_dest), np->rip6_plen,
1998                             ifcp->ifc_name);
1999                         rrt->rrt_next = riprt;
2000                         riprt = rrt;
2001                         addroute(rrt, &rrt->rrt_gw, ifcp);
2002                         sendrequest(ifcp);
2003                         ripsend(ifcp, &ifcp->ifc_ripsin, 0);
2004                         need_trigger = 1;
2005                 } else {
2006                         for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
2007                                 if (loop_rrt->rrt_index == ifcp->ifc_index) {
2008                                         t_lifetime = time(NULL) - RIP_LIFETIME;
2009                                         if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
2010                                                 loop_rrt->rrt_t = t_lifetime;
2011                                                 loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2012                                                 loop_rrt->rrt_rflags |= RRTF_CHANGED;
2013                                                 need_trigger = 1;
2014                                         }
2015                                 }
2016                         }
2017                 }
2018         }
2019         return need_trigger;
2020 }
2021
2022 /*
2023  * there are couple of p2p interface routing models.  "behavior" lets
2024  * you pick one.  it looks that gated behavior fits best with BSDs,
2025  * since BSD kernels does not look at prefix length on p2p interfaces.
2026  */
2027 void
2028 ifrt_p2p(struct ifc *ifcp, int again)
2029 {
2030         struct ifac *ifa;
2031         struct riprt *rrt, *orrt, *prevrrt;
2032         struct netinfo6 *np;
2033         struct in6_addr addr, dest;
2034         int advert, ignore, i;
2035 #define P2PADVERT_NETWORK       1
2036 #define P2PADVERT_ADDR          2
2037 #define P2PADVERT_DEST          4
2038 #define P2PADVERT_MAX           4
2039         const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2040         const char *category = "";
2041         const char *noadv;
2042
2043         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2044                 addr = ifa->ifa_addr;
2045                 dest = ifa->ifa_raddr;
2046                 applyplen(&addr, ifa->ifa_plen);
2047                 applyplen(&dest, ifa->ifa_plen);
2048                 advert = ignore = 0;
2049                 switch (behavior) {
2050                 case CISCO:
2051                         /*
2052                          * honor addr/plen, just like normal shared medium
2053                          * interface.  this may cause trouble if you reuse
2054                          * addr/plen on other interfaces.
2055                          *
2056                          * advertise addr/plen.
2057                          */
2058                         advert |= P2PADVERT_NETWORK;
2059                         break;
2060                 case GATED:
2061                         /*
2062                          * prefixlen on p2p interface is meaningless.
2063                          * advertise addr/128 and dest/128.
2064                          *
2065                          * do not install network route to route6d routing
2066                          * table (if we do, it would prevent route installation
2067                          * for other p2p interface that shares addr/plen).
2068                          *
2069                          * XXX what should we do if dest is ::?  it will not
2070                          * get announced anyways (see following filter),
2071                          * but we need to think.
2072                          */
2073                         advert |= P2PADVERT_ADDR;
2074                         advert |= P2PADVERT_DEST;
2075                         ignore |= P2PADVERT_NETWORK;
2076                         break;
2077                 case ROUTE6D:
2078                         /*
2079                          * just for testing.  actually the code is redundant
2080                          * given the current p2p interface address assignment
2081                          * rule for kame kernel.
2082                          *
2083                          * intent:
2084                          *      A/n -> announce A/n
2085                          *      A B/n, A and B share prefix -> A/n (= B/n)
2086                          *      A B/n, do not share prefix -> A/128 and B/128
2087                          * actually, A/64 and A B/128 are the only cases
2088                          * permitted by the kernel:
2089                          *      A/64 -> A/64
2090                          *      A B/128 -> A/128 and B/128
2091                          */
2092                         if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2093                                 if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2094                                         advert |= P2PADVERT_NETWORK;
2095                                 else {
2096                                         advert |= P2PADVERT_ADDR;
2097                                         advert |= P2PADVERT_DEST;
2098                                         ignore |= P2PADVERT_NETWORK;
2099                                 }
2100                         } else
2101                                 advert |= P2PADVERT_NETWORK;
2102                         break;
2103                 }
2104
2105                 for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2106                         if ((ignore & i) != 0)
2107                                 continue;
2108                         if ((rrt = MALLOC(struct riprt)) == NULL) {
2109                                 fatal("malloc: struct riprt");
2110                                 /*NOTREACHED*/
2111                         }
2112                         memset(rrt, 0, sizeof(*rrt));
2113                         rrt->rrt_same = NULL;
2114                         rrt->rrt_index = ifcp->ifc_index;
2115                         rrt->rrt_t = 0; /* don't age */
2116                         switch (i) {
2117                         case P2PADVERT_NETWORK:
2118                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2119                                 rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2120                                 applyplen(&rrt->rrt_info.rip6_dest,
2121                                     ifa->ifa_plen);
2122                                 category = "network";
2123                                 break;
2124                         case P2PADVERT_ADDR:
2125                                 rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2126                                 rrt->rrt_info.rip6_plen = 128;
2127                                 rrt->rrt_gw = in6addr_loopback;
2128                                 category = "addr";
2129                                 break;
2130                         case P2PADVERT_DEST:
2131                                 rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2132                                 rrt->rrt_info.rip6_plen = 128;
2133                                 rrt->rrt_gw = ifa->ifa_addr;
2134                                 category = "dest";
2135                                 break;
2136                         }
2137                         if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2138                             IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2139 #if 0
2140                                 trace(1, "route: %s: skip unspec/linklocal "
2141                                     "(%s on %s)\n", category, ifcp->ifc_name);
2142 #endif
2143                                 free(rrt);
2144                                 continue;
2145                         }
2146                         if ((advert & i) == 0) {
2147                                 rrt->rrt_rflags |= RRTF_NOADVERTISE;
2148                                 noadv = ", NO-ADV";
2149                         } else
2150                                 noadv = "";
2151                         rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2152                         rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2153                         np = &rrt->rrt_info;
2154                         orrt = rtsearch(np, &prevrrt);
2155                         if (!orrt) {
2156                                 /* Attach the route to the list */
2157                                 trace(1, "route: %s/%d: register route "
2158                                     "(%s on %s%s)\n",
2159                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2160                                     category, ifcp->ifc_name, noadv);
2161                                 rrt->rrt_next = riprt;
2162                                 riprt = rrt;
2163                         } else if (rrt->rrt_index != orrt->rrt_index ||
2164                             rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2165                                 /* swap route */
2166                                 rrt->rrt_next = orrt->rrt_next;
2167                                 if (prevrrt)
2168                                         prevrrt->rrt_next = rrt;
2169                                 else
2170                                         riprt = rrt;
2171                                 free(orrt);
2172
2173                                 trace(1, "route: %s/%d: update (%s on %s%s)\n",
2174                                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2175                                     category, ifcp->ifc_name, noadv);
2176                         } else {
2177                                 /* Already found */
2178                                 if (!again) {
2179                                         trace(1, "route: %s/%d: "
2180                                             "already registered (%s on %s%s)\n",
2181                                             inet6_n2p(&np->rip6_dest),
2182                                             np->rip6_plen, category,
2183                                             ifcp->ifc_name, noadv);
2184                                 }
2185                                 free(rrt);
2186                         }
2187                 }
2188         }
2189 #undef P2PADVERT_NETWORK
2190 #undef P2PADVERT_ADDR
2191 #undef P2PADVERT_DEST
2192 #undef P2PADVERT_MAX
2193 }
2194
2195 int
2196 getifmtu(int ifindex)
2197 {
2198         int     mib[6];
2199         char    *buf;
2200         size_t  msize;
2201         struct  if_msghdr *ifm;
2202         int     mtu;
2203
2204         mib[0] = CTL_NET;
2205         mib[1] = PF_ROUTE;
2206         mib[2] = 0;
2207         mib[3] = AF_INET6;
2208         mib[4] = NET_RT_IFLIST;
2209         mib[5] = ifindex;
2210         if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2211                 fatal("sysctl estimate NET_RT_IFLIST");
2212                 /*NOTREACHED*/
2213         }
2214         if ((buf = malloc(msize)) == NULL) {
2215                 fatal("malloc");
2216                 /*NOTREACHED*/
2217         }
2218         if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2219                 fatal("sysctl NET_RT_IFLIST");
2220                 /*NOTREACHED*/
2221         }
2222         ifm = (struct if_msghdr *)buf;
2223         mtu = ifm->ifm_data.ifi_mtu;
2224 #ifdef __DragonFly__
2225         if (ifindex != ifm->ifm_index) {
2226                 fatal("ifindex does not match with ifm_index");
2227                 /*NOTREACHED*/
2228         }
2229 #endif
2230         free(buf);
2231         return mtu;
2232 }
2233
2234 const char *
2235 rttypes(struct rt_msghdr *rtm)
2236 {
2237 #define RTTYPE(s, f) \
2238 do { \
2239         if (rtm->rtm_type == (f)) \
2240                 return (s); \
2241 } while (0)
2242         RTTYPE("ADD", RTM_ADD);
2243         RTTYPE("DELETE", RTM_DELETE);
2244         RTTYPE("CHANGE", RTM_CHANGE);
2245         RTTYPE("GET", RTM_GET);
2246         RTTYPE("LOSING", RTM_LOSING);
2247         RTTYPE("REDIRECT", RTM_REDIRECT);
2248         RTTYPE("MISS", RTM_MISS);
2249         RTTYPE("LOCK", RTM_LOCK);
2250         RTTYPE("OLDADD", RTM_OLDADD);
2251         RTTYPE("OLDDEL", RTM_OLDDEL);
2252         RTTYPE("RESOLVE", RTM_RESOLVE);
2253         RTTYPE("NEWADDR", RTM_NEWADDR);
2254         RTTYPE("DELADDR", RTM_DELADDR);
2255         RTTYPE("IFINFO", RTM_IFINFO);
2256 #ifdef RTM_OLDADD
2257         RTTYPE("OLDADD", RTM_OLDADD);
2258 #endif
2259 #ifdef RTM_OLDDEL
2260         RTTYPE("OLDDEL", RTM_OLDDEL);
2261 #endif
2262 #ifdef RTM_OIFINFO
2263         RTTYPE("OIFINFO", RTM_OIFINFO);
2264 #endif
2265 #ifdef RTM_IFANNOUNCE
2266         RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2267 #endif
2268 #ifdef RTM_NEWMADDR
2269         RTTYPE("NEWMADDR", RTM_NEWMADDR);
2270 #endif
2271 #ifdef RTM_DELMADDR
2272         RTTYPE("DELMADDR", RTM_DELMADDR);
2273 #endif
2274 #undef RTTYPE
2275         return NULL;
2276 }
2277
2278 const char *
2279 rtflags(struct rt_msghdr *rtm)
2280 {
2281         static char buf[BUFSIZ];
2282
2283         /*
2284          * letter conflict should be okay.  painful when *BSD diverges...
2285          */
2286         strlcpy(buf, "", sizeof(buf));
2287 #define RTFLAG(s, f) \
2288 do { \
2289         if (rtm->rtm_flags & (f)) \
2290                 strlcat(buf, (s), sizeof(buf)); \
2291 } while (0)
2292         RTFLAG("U", RTF_UP);
2293         RTFLAG("G", RTF_GATEWAY);
2294         RTFLAG("H", RTF_HOST);
2295         RTFLAG("R", RTF_REJECT);
2296         RTFLAG("D", RTF_DYNAMIC);
2297         RTFLAG("M", RTF_MODIFIED);
2298         RTFLAG("d", RTF_DONE);
2299 #ifdef  RTF_MASK
2300         RTFLAG("m", RTF_MASK);
2301 #endif
2302         RTFLAG("C", RTF_CLONING);
2303 #ifdef RTF_CLONED
2304         RTFLAG("c", RTF_CLONED);
2305 #endif
2306 #ifdef RTF_PRCLONING
2307         RTFLAG("c", RTF_PRCLONING);
2308 #endif
2309 #ifdef RTF_WASCLONED
2310         RTFLAG("W", RTF_WASCLONED);
2311 #endif
2312         RTFLAG("X", RTF_XRESOLVE);
2313         RTFLAG("L", RTF_LLINFO);
2314         RTFLAG("S", RTF_STATIC);
2315         RTFLAG("B", RTF_BLACKHOLE);
2316 #ifdef RTF_PROTO3
2317         RTFLAG("3", RTF_PROTO3);
2318 #endif
2319         RTFLAG("2", RTF_PROTO2);
2320         RTFLAG("1", RTF_PROTO1);
2321 #ifdef RTF_BROADCAST
2322         RTFLAG("b", RTF_BROADCAST);
2323 #endif
2324 #ifdef RTF_DEFAULT
2325         RTFLAG("d", RTF_DEFAULT);
2326 #endif
2327 #ifdef RTF_ISAROUTER
2328         RTFLAG("r", RTF_ISAROUTER);
2329 #endif
2330 #ifdef RTF_TUNNEL
2331         RTFLAG("T", RTF_TUNNEL);
2332 #endif
2333 #ifdef RTF_AUTH
2334         RTFLAG("A", RTF_AUTH);
2335 #endif
2336 #ifdef RTF_CRYPT
2337         RTFLAG("E", RTF_CRYPT);
2338 #endif
2339 #undef RTFLAG
2340         return buf;
2341 }
2342
2343 const char *
2344 ifflags(int flags)
2345 {
2346         static char buf[BUFSIZ];
2347
2348         strlcpy(buf, "", sizeof(buf));
2349 #define IFFLAG(s, f) \
2350 do { \
2351         if (flags & f) { \
2352                 if (buf[0]) \
2353                         strlcat(buf, ",", sizeof(buf)); \
2354                 strlcat(buf, s, sizeof(buf)); \
2355         } \
2356 } while (0)
2357         IFFLAG("UP", IFF_UP);
2358         IFFLAG("BROADCAST", IFF_BROADCAST);
2359         IFFLAG("DEBUG", IFF_DEBUG);
2360         IFFLAG("LOOPBACK", IFF_LOOPBACK);
2361         IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2362 #ifdef IFF_NOTRAILERS
2363         IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2364 #endif
2365 #ifdef IFF_SMART
2366         IFFLAG("SMART", IFF_SMART);
2367 #endif
2368         IFFLAG("RUNNING", IFF_RUNNING);
2369         IFFLAG("NOARP", IFF_NOARP);
2370         IFFLAG("PROMISC", IFF_PROMISC);
2371         IFFLAG("ALLMULTI", IFF_ALLMULTI);
2372         IFFLAG("OACTIVE", IFF_OACTIVE);
2373         IFFLAG("SIMPLEX", IFF_SIMPLEX);
2374         IFFLAG("LINK0", IFF_LINK0);
2375         IFFLAG("LINK1", IFF_LINK1);
2376         IFFLAG("LINK2", IFF_LINK2);
2377         IFFLAG("MULTICAST", IFF_MULTICAST);
2378 #undef IFFLAG
2379         return buf;
2380 }
2381
2382 void
2383 krtread(int again)
2384 {
2385         int mib[6];
2386         size_t msize;
2387         char *buf, *p, *lim;
2388         struct rt_msghdr *rtm;
2389         int retry;
2390         const char *errmsg;
2391
2392         retry = 0;
2393         buf = NULL;
2394         mib[0] = CTL_NET;
2395         mib[1] = PF_ROUTE;
2396         mib[2] = 0;
2397         mib[3] = AF_INET6;      /* Address family */
2398         mib[4] = NET_RT_DUMP;   /* Dump the kernel routing table */
2399         mib[5] = 0;             /* No flags */
2400         do {
2401                 retry++;
2402                 errmsg = NULL;
2403                 if (buf)
2404                         free(buf);
2405                 if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2406                         errmsg = "sysctl estimate";
2407                         continue;
2408                 }
2409                 if ((buf = malloc(msize)) == NULL) {
2410                         errmsg = "malloc";
2411                         continue;
2412                 }
2413                 if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2414                         errmsg = "sysctl NET_RT_DUMP";
2415                         continue;
2416                 }
2417         } while (retry < 5 && errmsg != NULL);
2418         if (errmsg) {
2419                 fatal("%s (with %d retries, msize=%lu)", errmsg, retry,
2420                     (u_long)msize);
2421                 /*NOTREACHED*/
2422         } else if (1 < retry)
2423                 syslog(LOG_INFO, "NET_RT_DUMP %d retires", retry);
2424
2425         lim = buf + msize;
2426         for (p = buf; p < lim; p += rtm->rtm_msglen) {
2427                 rtm = (struct rt_msghdr *)p;
2428                 rt_entry(rtm, again);
2429         }
2430         free(buf);
2431 }
2432
2433 void
2434 rt_entry(struct rt_msghdr *rtm, int again)
2435 {
2436         struct  sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2437         struct  sockaddr_in6 *sin6_genmask, *sin6_ifp;
2438         char    *rtmp, *ifname = NULL;
2439         struct  riprt *rrt, *orrt;
2440         struct  netinfo6 *np;
2441         int     s;
2442
2443         sin6_dst = sin6_gw = sin6_mask = sin6_genmask = sin6_ifp = NULL;
2444         if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2445                 (RTF_CLONING|RTF_XRESOLVE|RTF_LLINFO|RTF_BLACKHOLE)) {
2446                 return;         /* not interested in the link route */
2447         }
2448         /* do not look at cloned routes */
2449 #ifdef RTF_WASCLONED
2450         if (rtm->rtm_flags & RTF_WASCLONED)
2451                 return;
2452 #endif
2453 #ifdef RTF_CLONED
2454         if (rtm->rtm_flags & RTF_CLONED)
2455                 return;
2456 #endif
2457         /*
2458          * do not look at dynamic routes.
2459          * netbsd/openbsd cloned routes have UGHD.
2460          */
2461         if (rtm->rtm_flags & RTF_DYNAMIC)
2462                 return;
2463         rtmp = (char *)(rtm + 1);
2464         /* Destination */
2465         if ((rtm->rtm_addrs & RTA_DST) == 0)
2466                 return;         /* ignore routes without destination address */
2467         sin6_dst = (struct sockaddr_in6 *)rtmp;
2468         rtmp += ROUNDUP(sin6_dst->sin6_len);
2469         if (rtm->rtm_addrs & RTA_GATEWAY) {
2470                 sin6_gw = (struct sockaddr_in6 *)rtmp;
2471                 rtmp += ROUNDUP(sin6_gw->sin6_len);
2472         }
2473         if (rtm->rtm_addrs & RTA_NETMASK) {
2474                 sin6_mask = (struct sockaddr_in6 *)rtmp;
2475                 rtmp += ROUNDUP(sin6_mask->sin6_len);
2476         }
2477         if (rtm->rtm_addrs & RTA_GENMASK) {
2478                 sin6_genmask = (struct sockaddr_in6 *)rtmp;
2479                 rtmp += ROUNDUP(sin6_genmask->sin6_len);
2480         }
2481         if (rtm->rtm_addrs & RTA_IFP) {
2482                 sin6_ifp = (struct sockaddr_in6 *)rtmp;
2483                 rtmp += ROUNDUP(sin6_ifp->sin6_len);
2484         }
2485
2486         /* Destination */
2487         if (sin6_dst->sin6_family != AF_INET6)
2488                 return;
2489         if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2490                 return;         /* Link-local */
2491         if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2492                 return;         /* Loopback */
2493         if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2494                 return;
2495
2496         if ((rrt = MALLOC(struct riprt)) == NULL) {
2497                 fatal("malloc: struct riprt");
2498                 /*NOTREACHED*/
2499         }
2500         memset(rrt, 0, sizeof(*rrt));
2501         np = &rrt->rrt_info;
2502         rrt->rrt_same = NULL;
2503         rrt->rrt_t = time(NULL);
2504         if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2505                 rrt->rrt_t = 0; /* Don't age static routes */
2506 #if 0
2507         np->rip6_tag = htons(routetag & 0xffff);
2508 #else
2509         np->rip6_tag = 0;
2510 #endif
2511         np->rip6_metric = rtm->rtm_rmx.rmx_hopcount;
2512         if (np->rip6_metric < 1)
2513                 np->rip6_metric = 1;
2514         rrt->rrt_flags = rtm->rtm_flags;
2515         np->rip6_dest = sin6_dst->sin6_addr;
2516
2517         /* Mask or plen */
2518         if (rtm->rtm_flags & RTF_HOST)
2519                 np->rip6_plen = 128;    /* Host route */
2520         else if (sin6_mask)
2521                 np->rip6_plen = sin6mask2len(sin6_mask);
2522         else
2523                 np->rip6_plen = 0;
2524
2525         orrt = rtsearch(np, NULL);
2526         if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2527                 /* Already found */
2528                 if (!again) {
2529                         trace(1, "route: %s/%d flags %s: already registered\n",
2530                                 inet6_n2p(&np->rip6_dest), np->rip6_plen,
2531                                 rtflags(rtm));
2532                 }
2533                 free(rrt);
2534                 return;
2535         }
2536         /* Gateway */
2537         if (!sin6_gw)
2538                 memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2539         else {
2540                 if (sin6_gw->sin6_family == AF_INET6)
2541                         rrt->rrt_gw = sin6_gw->sin6_addr;
2542                 else if (sin6_gw->sin6_family == AF_LINK) {
2543                         /* XXX in case ppp link? */
2544                         rrt->rrt_gw = in6addr_loopback;
2545                 } else
2546                         memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2547         }
2548         trace(1, "route: %s/%d flags %s",
2549                 inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2550         trace(1, " gw %s", inet6_n2p(&rrt->rrt_gw));
2551
2552         /* Interface */
2553         s = rtm->rtm_index;
2554         if (s < nindex2ifc && index2ifc[s])
2555                 ifname = index2ifc[s]->ifc_name;
2556         else {
2557                 trace(1, " not configured\n");
2558                 free(rrt);
2559                 return;
2560         }
2561         trace(1, " if %s sock %d", ifname, s);
2562         rrt->rrt_index = s;
2563
2564         trace(1, "\n");
2565
2566         /* Check gateway */
2567         if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2568             !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)
2569 #ifdef __DragonFly__
2570          && (rrt->rrt_flags & RTF_LOCAL) == 0
2571 #endif
2572             ) {
2573                 trace(0, "***** Gateway %s is not a link-local address.\n",
2574                         inet6_n2p(&rrt->rrt_gw));
2575                 trace(0, "*****     dest(%s) if(%s) -- Not optimized.\n",
2576                         inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2577                 rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2578         }
2579
2580         /* Put it to the route list */
2581         if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2582                 /* replace route list */
2583                 rrt->rrt_next = orrt->rrt_next;
2584                 *orrt = *rrt;
2585                 trace(1, "route: %s/%d flags %s: replace new route\n",
2586                     inet6_n2p(&np->rip6_dest), np->rip6_plen,
2587                     rtflags(rtm));
2588                 free(rrt);
2589         } else {
2590                 rrt->rrt_next = riprt;
2591                 riprt = rrt;
2592         }
2593 }
2594
2595 int
2596 addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
2597 {
2598         struct  netinfo6 *np;
2599         u_char  buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2600         struct  rt_msghdr       *rtm;
2601         struct  sockaddr_in6    *sin;
2602         int     len;
2603
2604         np = &rrt->rrt_info;
2605         inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2606         inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2607         tracet(1, "ADD: %s/%d gw %s [%d] ifa %s\n",
2608                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2609                 np->rip6_metric - 1, buf2);
2610         if (rtlog)
2611                 fprintf(rtlog, "%s: ADD: %s/%d gw %s [%d] ifa %s\n", hms(),
2612                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2613                         np->rip6_metric - 1, buf2);
2614         if (nflag)
2615                 return 0;
2616
2617         memset(buf, 0, sizeof(buf));
2618         rtm = (struct rt_msghdr *)buf;
2619         rtm->rtm_type = RTM_ADD;
2620         rtm->rtm_version = RTM_VERSION;
2621         rtm->rtm_seq = ++seq;
2622         rtm->rtm_pid = pid;
2623         rtm->rtm_flags = rrt->rrt_flags;
2624         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2625         rtm->rtm_rmx.rmx_hopcount = np->rip6_metric - 1;
2626         rtm->rtm_inits = RTV_HOPCOUNT;
2627         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2628         /* Destination */
2629         sin->sin6_len = sizeof(struct sockaddr_in6);
2630         sin->sin6_family = AF_INET6;
2631         sin->sin6_addr = np->rip6_dest;
2632         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2633         /* Gateway */
2634         sin->sin6_len = sizeof(struct sockaddr_in6);
2635         sin->sin6_family = AF_INET6;
2636         sin->sin6_addr = *gw;
2637         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2638         /* Netmask */
2639         sin->sin6_len = sizeof(struct sockaddr_in6);
2640         sin->sin6_family = AF_INET6;
2641         sin->sin6_addr = *(plen2mask(np->rip6_plen));
2642         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2643
2644         len = (char *)sin - (char *)buf;
2645         rtm->rtm_msglen = len;
2646         if (write(rtsock, buf, len) > 0)
2647                 return 0;
2648
2649         if (errno == EEXIST) {
2650                 trace(0, "ADD: Route already exists %s/%d gw %s\n",
2651                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2652                 if (rtlog)
2653                         fprintf(rtlog, "ADD: Route already exists %s/%d gw %s\n",
2654                                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2655         } else {
2656                 trace(0, "Can not write to rtsock (addroute): %s\n",
2657                         strerror(errno));
2658                 if (rtlog)
2659                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2660                                 strerror(errno));
2661         }
2662         return -1;
2663 }
2664
2665 int
2666 delroute(struct netinfo6 *np, struct in6_addr *gw)
2667 {
2668         u_char  buf[BUFSIZ], buf2[BUFSIZ];
2669         struct  rt_msghdr       *rtm;
2670         struct  sockaddr_in6    *sin;
2671         int     len;
2672
2673         inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2674         tracet(1, "DEL: %s/%d gw %s\n", inet6_n2p(&np->rip6_dest),
2675                 np->rip6_plen, buf2);
2676         if (rtlog)
2677                 fprintf(rtlog, "%s: DEL: %s/%d gw %s\n",
2678                         hms(), inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2679         if (nflag)
2680                 return 0;
2681
2682         memset(buf, 0, sizeof(buf));
2683         rtm = (struct rt_msghdr *)buf;
2684         rtm->rtm_type = RTM_DELETE;
2685         rtm->rtm_version = RTM_VERSION;
2686         rtm->rtm_seq = ++seq;
2687         rtm->rtm_pid = pid;
2688         rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2689         if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2690                 rtm->rtm_flags |= RTF_HOST;
2691         rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2692         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2693         /* Destination */
2694         sin->sin6_len = sizeof(struct sockaddr_in6);
2695         sin->sin6_family = AF_INET6;
2696         sin->sin6_addr = np->rip6_dest;
2697         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2698         /* Gateway */
2699         sin->sin6_len = sizeof(struct sockaddr_in6);
2700         sin->sin6_family = AF_INET6;
2701         sin->sin6_addr = *gw;
2702         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2703         /* Netmask */
2704         sin->sin6_len = sizeof(struct sockaddr_in6);
2705         sin->sin6_family = AF_INET6;
2706         sin->sin6_addr = *(plen2mask(np->rip6_plen));
2707         sin = (struct sockaddr_in6 *)((char *)sin + ROUNDUP(sin->sin6_len));
2708
2709         len = (char *)sin - (char *)buf;
2710         rtm->rtm_msglen = len;
2711         if (write(rtsock, buf, len) >= 0)
2712                 return 0;
2713
2714         if (errno == ESRCH) {
2715                 trace(0, "RTDEL: Route does not exist: %s/%d gw %s\n",
2716                         inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2717                 if (rtlog)
2718                         fprintf(rtlog, "RTDEL: Route does not exist: %s/%d gw %s\n",
2719                                 inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2720         } else {
2721                 trace(0, "Can not write to rtsock (delroute): %s\n",
2722                         strerror(errno));
2723                 if (rtlog)
2724                         fprintf(rtlog, "\tCan not write to rtsock: %s\n",
2725                                 strerror(errno));
2726         }
2727         return -1;
2728 }
2729
2730 struct in6_addr *
2731 getroute(struct netinfo6 *np, struct in6_addr *gw)
2732 {
2733         u_char buf[BUFSIZ];
2734         u_long myseq;
2735         int len;
2736         struct rt_msghdr *rtm;
2737         struct sockaddr_in6 *sin;
2738
2739         rtm = (struct rt_msghdr *)buf;
2740         len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2741         memset(rtm, 0, len);
2742         rtm->rtm_type = RTM_GET;
2743         rtm->rtm_version = RTM_VERSION;
2744         myseq = ++seq;
2745         rtm->rtm_seq = myseq;
2746         rtm->rtm_addrs = RTA_DST;
2747         rtm->rtm_msglen = len;
2748         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2749         sin->sin6_len = sizeof(struct sockaddr_in6);
2750         sin->sin6_family = AF_INET6;
2751         sin->sin6_addr = np->rip6_dest;
2752         if (write(rtsock, buf, len) < 0) {
2753                 if (errno == ESRCH)     /* No such route found */
2754                         return NULL;
2755                 perror("write to rtsock");
2756                 exit(1);
2757         }
2758         do {
2759                 if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2760                         perror("read from rtsock");
2761                         exit(1);
2762                 }
2763                 rtm = (struct rt_msghdr *)buf;
2764         } while (rtm->rtm_seq != myseq || rtm->rtm_pid != pid);
2765         sin = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2766         if (rtm->rtm_addrs & RTA_DST) {
2767                 sin = (struct sockaddr_in6 *)
2768                         ((char *)sin + ROUNDUP(sin->sin6_len));
2769         }
2770         if (rtm->rtm_addrs & RTA_GATEWAY) {
2771                 *gw = sin->sin6_addr;
2772                 return gw;
2773         }
2774         return NULL;
2775 }
2776
2777 const char *
2778 inet6_n2p(const struct in6_addr *p)
2779 {
2780         static char buf[BUFSIZ];
2781
2782         return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2783 }
2784
2785 void
2786 ifrtdump(int sig)
2787 {
2788         ifdump(sig);
2789         rtdump(sig);
2790 }
2791
2792 void
2793 ifdump(int sig)
2794 {
2795         struct ifc *ifcp;
2796         FILE *dump;
2797         int i;
2798
2799         if (sig == 0)
2800                 dump = stderr;
2801         else
2802                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2803                         dump = stderr;
2804
2805         fprintf(dump, "%s: Interface Table Dump\n", hms());
2806         fprintf(dump, "  Number of interfaces: %d\n", nifc);
2807         for (i = 0; i < 2; i++) {
2808                 fprintf(dump, "  %sadvertising interfaces:\n", i ? "non-" : "");
2809                 for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2810                         if (i == 0) {
2811                                 if ((ifcp->ifc_flags & IFF_UP) == 0)
2812                                         continue;
2813                                 if (iff_find(ifcp, 'N') != NULL)
2814                                         continue;
2815                         } else {
2816                                 if (ifcp->ifc_flags & IFF_UP)
2817                                         continue;
2818                         }
2819                         ifdump0(dump, ifcp);
2820                 }
2821         }
2822         fprintf(dump, "\n");
2823         if (dump != stderr)
2824                 fclose(dump);
2825 }
2826
2827 void
2828 ifdump0(FILE *dump, const struct ifc *ifcp)
2829 {
2830         struct ifac *ifa;
2831         struct iff *iffp;
2832         char buf[BUFSIZ];
2833         const char *ft;
2834         int addr;
2835
2836         fprintf(dump, "    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)\n",
2837                 ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2838                 inet6_n2p(&ifcp->ifc_mylladdr),
2839                 ifcp->ifc_mtu, ifcp->ifc_metric);
2840         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2841                 if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2842                         inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2843                                 buf, sizeof(buf));
2844                         fprintf(dump, "\t%s/%d -- %s\n",
2845                                 inet6_n2p(&ifa->ifa_addr),
2846                                 ifa->ifa_plen, buf);
2847                 } else {
2848                         fprintf(dump, "\t%s/%d\n",
2849                                 inet6_n2p(&ifa->ifa_addr),
2850                                 ifa->ifa_plen);
2851                 }
2852         }
2853         if (ifcp->ifc_filter) {
2854                 fprintf(dump, "\tFilter:");
2855                 for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2856                         addr = 0;
2857                         switch (iffp->iff_type) {
2858                         case 'A':
2859                                 ft = "Aggregate"; addr++; break;
2860                         case 'N':
2861                                 ft = "No-use"; break;
2862                         case 'O':
2863                                 ft = "Advertise-only"; addr++; break;
2864                         case 'T':
2865                                 ft = "Default-only"; break;
2866                         case 'L':
2867                                 ft = "Listen-only"; addr++; break;
2868                         default:
2869                                 snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2870                                 ft = buf;
2871                                 addr++;
2872                                 break;
2873                         }
2874                         fprintf(dump, " %s", ft);
2875                         if (addr) {
2876                                 fprintf(dump, "(%s/%d)", inet6_n2p(&iffp->iff_addr),
2877                                         iffp->iff_plen);
2878                         }
2879                 }
2880                 fprintf(dump, "\n");
2881         }
2882 }
2883
2884 void
2885 rtdump(int sig)
2886 {
2887         struct  riprt *rrt;
2888         char    buf[BUFSIZ];
2889         FILE    *dump;
2890         time_t  t, age;
2891
2892         if (sig == 0)
2893                 dump = stderr;
2894         else
2895                 if ((dump = fopen(ROUTE6D_DUMP, "a")) == NULL)
2896                         dump = stderr;
2897
2898         t = time(NULL);
2899         fprintf(dump, "\n%s: Routing Table Dump\n", hms());
2900         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2901                 if (rrt->rrt_t == 0)
2902                         age = 0;
2903                 else
2904                         age = t - rrt->rrt_t;
2905                 inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2906                         buf, sizeof(buf));
2907                 fprintf(dump, "    %s/%d if(%d:%s) gw(%s) [%d] age(%ld)",
2908                         buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2909                         index2ifc[rrt->rrt_index]->ifc_name,
2910                         inet6_n2p(&rrt->rrt_gw),
2911                         rrt->rrt_info.rip6_metric, (long)age);
2912                 if (rrt->rrt_info.rip6_tag) {
2913                         fprintf(dump, " tag(0x%04x)",
2914                                 ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2915                 }
2916                 if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2917                         fprintf(dump, " NOT-LL");
2918                 if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2919                         fprintf(dump, " NO-ADV");
2920                 fprintf(dump, "\n");
2921         }
2922         fprintf(dump, "\n");
2923         if (dump != stderr)
2924                 fclose(dump);
2925 }
2926
2927 /*
2928  * Parse the -A (and -O) options and put corresponding filter object to the
2929  * specified interface structures.  Each of the -A/O option has the following
2930  * syntax:      -A 5f09:c400::/32,ef0,ef1  (aggregate)
2931  *              -O 5f09:c400::/32,ef0,ef1  (only when match)
2932  */
2933 void
2934 filterconfig(void)
2935 {
2936         int i;
2937         char *p, *ap, *iflp, *ifname;
2938         struct iff ftmp, *iff_obj;
2939         struct ifc *ifcp;
2940         struct riprt *rrt;
2941 #if 0
2942         struct in6_addr gw;
2943 #endif
2944
2945         for (i = 0; i < nfilter; i++) {
2946                 ap = filter[i];
2947                 iflp = NULL;
2948                 ifcp = NULL;
2949                 if (filtertype[i] == 'N' || filtertype[i] == 'T') {
2950                         iflp = ap;
2951                         goto ifonly;
2952                 }
2953                 if ((p = strchr(ap, ',')) != NULL) {
2954                         *p++ = '\0';
2955                         iflp = p;
2956                 }
2957                 if ((p = strchr(ap, '/')) == NULL) {
2958                         fatal("no prefixlen specified for '%s'", ap);
2959                         /*NOTREACHED*/
2960                 }
2961                 *p++ = '\0';
2962                 if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
2963                         fatal("invalid prefix specified for '%s'", ap);
2964                         /*NOTREACHED*/
2965                 }
2966                 ftmp.iff_plen = atoi(p);
2967                 ftmp.iff_next = NULL;
2968                 applyplen(&ftmp.iff_addr, ftmp.iff_plen);
2969 ifonly:
2970                 ftmp.iff_type = filtertype[i];
2971                 if (iflp == NULL || *iflp == '\0') {
2972                         fatal("no interface specified for '%s'", ap);
2973                         /*NOTREACHED*/
2974                 }
2975                 /* parse the interface listing portion */
2976                 while (iflp) {
2977                         ifname = iflp;
2978                         if ((iflp = strchr(iflp, ',')) != NULL)
2979                                 *iflp++ = '\0';
2980                         ifcp = ifc_find(ifname);
2981                         if (ifcp == NULL) {
2982                                 fatal("no interface %s exists", ifname);
2983                                 /*NOTREACHED*/
2984                         }
2985                         iff_obj = (struct iff *)malloc(sizeof(struct iff));
2986                         if (iff_obj == NULL) {
2987                                 fatal("malloc of iff_obj");
2988                                 /*NOTREACHED*/
2989                         }
2990                         memcpy((void *)iff_obj, (void *)&ftmp,
2991                             sizeof(struct iff));
2992                         /* link it to the interface filter */
2993                         iff_obj->iff_next = ifcp->ifc_filter;
2994                         ifcp->ifc_filter = iff_obj;
2995                 }
2996
2997                 /*
2998                  * -A: aggregate configuration.
2999                  */
3000                 if (filtertype[i] != 'A')
3001                         continue;
3002                 /* put the aggregate to the kernel routing table */
3003                 rrt = (struct riprt *)malloc(sizeof(struct riprt));
3004                 if (rrt == NULL) {
3005                         fatal("malloc: rrt");
3006                         /*NOTREACHED*/
3007                 }
3008                 memset(rrt, 0, sizeof(struct riprt));
3009                 rrt->rrt_info.rip6_dest = ftmp.iff_addr;
3010                 rrt->rrt_info.rip6_plen = ftmp.iff_plen;
3011                 rrt->rrt_info.rip6_metric = 1;
3012                 rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
3013                 rrt->rrt_gw = in6addr_loopback;
3014                 rrt->rrt_flags = RTF_UP | RTF_REJECT;
3015                 rrt->rrt_rflags = RRTF_AGGREGATE;
3016                 rrt->rrt_t = 0;
3017                 rrt->rrt_index = loopifindex;
3018 #if 0
3019                 if (getroute(&rrt->rrt_info, &gw)) {
3020 #if 0
3021                         /*
3022                          * When the address has already been registered in the
3023                          * kernel routing table, it should be removed
3024                          */
3025                         delroute(&rrt->rrt_info, &gw);
3026 #else
3027                         /* it is safer behavior */
3028                         errno = EINVAL;
3029                         fatal("%s/%u already in routing table, "
3030                             "cannot aggregate",
3031                             inet6_n2p(&rrt->rrt_info.rip6_dest),
3032                             rrt->rrt_info.rip6_plen);
3033                         /*NOTREACHED*/
3034 #endif
3035                 }
3036 #endif
3037                 /* Put the route to the list */
3038                 rrt->rrt_next = riprt;
3039                 riprt = rrt;
3040                 trace(1, "Aggregate: %s/%d for %s\n",
3041                         inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
3042                         ifcp->ifc_name);
3043                 /* Add this route to the kernel */
3044                 if (nflag)      /* do not modify kernel routing table */
3045                         continue;
3046                 addroute(rrt, &in6addr_loopback, loopifcp);
3047         }
3048 }
3049
3050 /***************** utility functions *****************/
3051
3052 /*
3053  * Returns a pointer to ifac whose address and prefix length matches
3054  * with the address and prefix length specified in the arguments.
3055  */
3056 struct ifac *
3057 ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
3058 {
3059         struct ifac *ifa;
3060
3061         for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3062                 if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3063                     ifa->ifa_plen == plen)
3064                         break;
3065         }
3066         return ifa;
3067 }
3068
3069 /*
3070  * Return a pointer to riprt structure whose address and prefix length
3071  * matches with the address and prefix length found in the argument.
3072  * Note: This is not a rtalloc().  Therefore exact match is necessary.
3073  */
3074 struct riprt *
3075 rtsearch(struct netinfo6 *np, struct riprt **prev_rrt)
3076 {
3077         struct  riprt   *rrt;
3078
3079         if (prev_rrt)
3080                 *prev_rrt = NULL;
3081         for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3082                 if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3083                     IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3084                                        &np->rip6_dest))
3085                         return rrt;
3086                 if (prev_rrt)
3087                         *prev_rrt = rrt;
3088         }
3089         if (prev_rrt)
3090                 *prev_rrt = NULL;
3091         return 0;
3092 }
3093
3094 int
3095 sin6mask2len(const struct sockaddr_in6 *sin6)
3096 {
3097         return mask2len(&sin6->sin6_addr,
3098             sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3099 }
3100
3101 int
3102 mask2len(const struct in6_addr *addr, int lenlim)
3103 {
3104         int i = 0, j;
3105         const u_char *p = (const u_char *)addr;
3106
3107         for (j = 0; j < lenlim; j++, p++) {
3108                 if (*p != 0xff)
3109                         break;
3110                 i += 8;
3111         }
3112         if (j < lenlim) {
3113                 switch (*p) {
3114 #define MASKLEN(m, l)   case m: do { i += l; break; } while (0)
3115                 MASKLEN(0xfe, 7); break;
3116                 MASKLEN(0xfc, 6); break;
3117                 MASKLEN(0xf8, 5); break;
3118                 MASKLEN(0xf0, 4); break;
3119                 MASKLEN(0xe0, 3); break;
3120                 MASKLEN(0xc0, 2); break;
3121                 MASKLEN(0x80, 1); break;
3122 #undef  MASKLEN
3123                 }
3124         }
3125         return i;
3126 }
3127
3128 void
3129 applymask(struct in6_addr *addr, struct in6_addr *mask)
3130 {
3131         int     i;
3132         u_long  *p, *q;
3133
3134         p = (u_long *)addr; q = (u_long *)mask;
3135         for (i = 0; i < 4; i++)
3136                 *p++ &= *q++;
3137 }
3138
3139 static const u_char plent[8] = {
3140         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3141 };
3142
3143 void
3144 applyplen(struct in6_addr *ia, int plen)
3145 {
3146         u_char  *p;
3147         int     i;
3148
3149         p = ia->s6_addr;
3150         for (i = 0; i < 16; i++) {
3151                 if (plen <= 0)
3152                         *p = 0;
3153                 else if (plen < 8)
3154                         *p &= plent[plen];
3155                 p++, plen -= 8;
3156         }
3157 }
3158
3159 static const int pl2m[9] = {
3160         0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3161 };
3162
3163 struct in6_addr *
3164 plen2mask(int n)
3165 {
3166         static struct in6_addr ia;
3167         u_char  *p;
3168         int     i;
3169
3170         memset(&ia, 0, sizeof(struct in6_addr));
3171         p = (u_char *)&ia;
3172         for (i = 0; i < 16; i++, p++, n -= 8) {
3173                 if (n >= 8) {
3174                         *p = 0xff;
3175                         continue;
3176                 }
3177                 *p = pl2m[n];
3178                 break;
3179         }
3180         return &ia;
3181 }
3182
3183 char *
3184 allocopy(char *p)
3185 {
3186         char *q = (char *)malloc(strlen(p) + 1);
3187
3188         strcpy(q, p);
3189         return q;
3190 }
3191
3192 char *
3193 hms(void)
3194 {
3195         static char buf[BUFSIZ];
3196         time_t t;
3197         struct  tm *tm;
3198
3199         t = time(NULL);
3200         if ((tm = localtime(&t)) == NULL) {
3201                 fatal("localtime");
3202                 /*NOTREACHED*/
3203         }
3204         snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3205             tm->tm_sec);
3206         return buf;
3207 }
3208
3209 #define RIPRANDDEV      1.0     /* 30 +- 15, max - min = 30 */
3210
3211 int
3212 ripinterval(int timer)
3213 {
3214         double r = rand();
3215
3216         interval = (int)(timer + timer * RIPRANDDEV * (r / RAND_MAX - 0.5));
3217         nextalarm = time(NULL) + interval;
3218         return interval;
3219 }
3220
3221 time_t
3222 ripsuptrig(void)
3223 {
3224         time_t t;
3225
3226         double r = rand();
3227         t  = (int)(RIP_TRIG_INT6_MIN +
3228                 (RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / RAND_MAX));
3229         sup_trig_update = time(NULL) + t;
3230         return t;
3231 }
3232
3233 void
3234 fatal(const char *fmt, ...)
3235 {
3236         va_list ap;
3237         char buf[1024];
3238
3239         va_start(ap, fmt);
3240         vsnprintf(buf, sizeof(buf), fmt, ap);
3241         perror(buf);
3242         syslog(LOG_ERR, "%s: %s", buf, strerror(errno));
3243         rtdexit();
3244         va_end(ap);
3245 }
3246
3247 void
3248 tracet(int level, const char *fmt, ...)
3249 {
3250         va_list ap;
3251
3252         va_start(ap, fmt);
3253         if (level <= dflag) {
3254                 fprintf(stderr, "%s: ", hms());
3255                 vfprintf(stderr, fmt, ap);
3256         }
3257         if (dflag) {
3258                 if (level > 0)
3259                         vsyslog(LOG_DEBUG, fmt, ap);
3260                 else
3261                         vsyslog(LOG_WARNING, fmt, ap);
3262         }
3263         va_end(ap);
3264 }
3265
3266 void
3267 trace(int level, const char *fmt, ...)
3268 {
3269         va_list ap;
3270
3271         va_start(ap, fmt);
3272         if (level <= dflag)
3273                 vfprintf(stderr, fmt, ap);
3274         if (dflag) {
3275                 if (level > 0)
3276                         vsyslog(LOG_DEBUG, fmt, ap);
3277                 else
3278                         vsyslog(LOG_WARNING, fmt, ap);
3279         }
3280         va_end(ap);
3281 }
3282
3283 unsigned int
3284 if_maxindex(void)
3285 {
3286         struct if_nameindex *p, *p0;
3287         unsigned int max = 0;
3288
3289         p0 = if_nameindex();
3290         for (p = p0; p && p->if_index && p->if_name; p++) {
3291                 if (max < p->if_index)
3292                         max = p->if_index;
3293         }
3294         if_freenameindex(p0);
3295         return max;
3296 }
3297
3298 struct ifc *
3299 ifc_find(char *name)
3300 {
3301         struct ifc *ifcp;
3302
3303         for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3304                 if (strcmp(name, ifcp->ifc_name) == 0)
3305                         return ifcp;
3306         }
3307         return NULL;
3308 }
3309
3310 struct iff *
3311 iff_find(struct ifc *ifcp, int type)
3312 {
3313         struct iff *iffp;
3314
3315         for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3316                 if (iffp->iff_type == type)
3317                         return iffp;
3318         }
3319         return NULL;
3320 }
3321
3322 void
3323 setindex2ifc(int idx, struct ifc *ifcp)
3324 {
3325         int n;
3326         struct ifc **p;
3327
3328         if (!index2ifc) {
3329                 nindex2ifc = 5; /*initial guess*/
3330                 index2ifc = (struct ifc **)
3331                         malloc(sizeof(*index2ifc) * nindex2ifc);
3332                 if (index2ifc == NULL) {
3333                         fatal("malloc");
3334                         /*NOTREACHED*/
3335                 }
3336                 memset(index2ifc, 0, sizeof(*index2ifc) * nindex2ifc);
3337         }
3338         n = nindex2ifc;
3339         while (nindex2ifc <= idx)
3340                 nindex2ifc *= 2;
3341         if (n != nindex2ifc) {
3342                 p = (struct ifc **)realloc(index2ifc,
3343                     sizeof(*index2ifc) * nindex2ifc);
3344                 if (p == NULL) {
3345                         fatal("realloc");
3346                         /*NOTREACHED*/
3347                 }
3348                 memset(p + n, 0, sizeof(*index2ifc) * (nindex2ifc - n));
3349                 index2ifc = p;
3350         }
3351         index2ifc[idx] = ifcp;
3352 }